Doctor Mousa's face had turned a milky pale, jaw dropping at what she witnessed. She was well aware her work was highly dangerous, and most relevantly, extremely unpredictable. What was happening to Yang was something she could have never calculated, and frankly, the thought of what else could have happened scared her more.

The young huntress expanded at a steady pace, growing taller and taller as seconds passed. She appeared to be unaware or too angry to notice her growth, even when she easily hit the twenty foot mark. The fire enveloping her body grew with her as well, and to all who witnessed her saw a fearsome sight. A giant young woman aflame with fury and wrath, the physical embodiment of an enraged goddess.

If Doctor Mousa was scared, then the two Fang goons responsible for this were on a level of scared that transcended space and time. The guy fainted while the female dropped the weapon and merely stood there, a combination of awestruck and terrified beyond her comprehension.

"ROAR!" Went Yang as if she was a monster, stomping close to her victims.

She only appeared to notice something was different when she saw them by her feet.

"Wait..." She muttered, the flame subsiding significantly at the realization as anger was converted to confusion. "W-what the heck!? Why is everything so small?"

"N-no..." The blonde heard a voice squeak, albeit faintly. She turned to her left and looked down, seeing a trembling Doctor Mousa hiding behind a workbench. "You... you grew bigger!"

"Bigger?" Yang echoed after the doctor.

Confusion overtaking her anger, the flames disappeared and she gazed at her hands, checking herself over to see that she really was much bigger than she was before. Where normally she stands at 5'8, she was now something like thirty feet tall. Everything was much smaller than her now, almost like mini-toy versions of what they are, and aside from the strange feeling of being larger than everything, she otherwise felt nothing different about herself. Any sense of anger she had was now replaced with plain bewilderment at her current situation. If anything, a new sense of wonder was starting to set in.

"Huh... look at that..." She said as she reached to the ceiling, easily able to touch the top with her hand. "I'm huge now!"

"Yang?" Doctor Mousa asked for her, trying not to flinch when those big lilac eyes locked on her. "Are you alright? Does anything... hurt? Or, tickle? Anything?"

"Um, no." Yang calmly answered, feeling her now incredibly long hair. "If anything... this is kinda cool."

Doctor Mousa seemed to breathe a sigh of relief at that. That sigh soon turned into a shriek when Yang's hand suddenly enclosed the little mouse Faunus' torso. Before Doctor Mousa's sensitive heart knew it, she was held up at face level with Yang's smile in full view.

"Meep! Y-yang!?"

"You're so cute!" Yang cooed, seemingly entranced by how small and... non-threatening everything was in comparison to her now. In the midst of her amusement, her mind totally forgot about the two White Fang goons responsible for this. Or rather the female deer as she was currently trying to drag away the fainted guy behind various objects cluttered around the lab. Unfortunately for them, Yang wasn't so forgetful. Right when they were at the home stretch with a little dash towards the exit in sight, Yang had spotted them. "Hey! Where do you think you're going!?"

Her increased size giving her voice that much authority, the Faunus turned and saw the female giant gaze at them, getting increasingly annoyed with their attempt at escape.

"I didn't forget what you did to me..." At those words, Yang's eyes once again turned red, and her hair shimmered with a growing fire.

In a panic, the woman ditched her friend and bolted out the door, only to get knocked out cold by Ruby when she ran right into the young huntress.

"Ha! Another one downnnnn-WHOA WHAT THE HECK!?" The leader of Team RWBY screeched upon seeing the metaphorical elephant in the room. "Y-Yang!?"

Yang could only shoot her baby sister a shy smile. This definitely wasn't going to be easy to explain. "Uh... hehe... hey Rubes..." Yang addressed her literally little sister. Wanting to be less imposing, the blonde got down to her knees where she still towered over the starstruck Ruby. Yang, who was holding onto the shaking Doctor Mousa this whole time, finally put the fearful Faunus doctor down

"What happened? Why are you so big!?" Ruby asked, sounding to be less concerned and more excited than anything. Knowing Ruby, Yang assumed she thought this was cool, which to be fair, the blonde thought it was cool too.

"Well... I ran into this secret weapons room to clear it, right? And then I got shot with this weird laser gun. Next thing I know..." She waved her hands together. "This happened to me." Realizing Doctor Mousa was definitely more qualified to explain the science part of why this happened to her, the giant gave the squeamish doctor a little nudge. "Go ahead."

"H-huh? Oh! Um... well..." Mousa hesitated, thinking of the best way to answer. "That weapon that struck you is an experimental semblance amplifier. It's not much of a weapon really, but it... does hurt when you're hit by it."

"A semblance amplifier?" Ruby asked, getting ever curious.

"Yes. The idea was simple: create a device that amplifies a person's semblance in hopefully good ways. To be quite frank, this was never fired until today..."

"Sooooo... you're telling me my sister got shot with a semblance amplifier, and it made her huge?"

"Yes." Doctor Mousa nodded. "I have no idea of knowing when she'll return to-" Right before she finished, Doctor Mousa and Ruby watched as Yang suddenly began to shrink, decreasing in size until she was her normal height. "Oh, there we go." The doctor approached Yang, intrigued now at the result of her work. "Yang, may I ask what your semblance is?"

"My semblance allows me to take hits and use it to make stronger. Usually activates when I'm angry, if you haven't noticed. Eyes turn red, hair catches on fire..."

"Hmm... then that must mean the semblance amplifier made it so that in addition to getting stronger upon taking damage, you now increase in size! I suppose that still means you're getting stronger, technically... on account of being bigger."

"That's awesome!" Yang beamed. "So now whenever I get into a fight, I'll be unbeatable! Heh, I'd like to see someone fight a giant me! Right Rubes?" There was no response from Ruby. "Ruby?"

Yang looked to where Ruby was and saw that she had disappeared. She looked around and saw Ruby scampering around the secret weapons in the lab.

"C'mon, c'mon! Where's the amplifier thingy at? I wanna be SUPER FAST!"

"No no! NO!" Doctor Mousa yelled as she pounced on the device. "It's still highly unpredictable! Yang's lucky she didn't blow up. Or... worse." She said to Ruby. The doctor frowned upon inspecting her device. "Ohhh, and it appears to have been overloaded. The energy consumption was so intense that it fried all the systems..." The doctor said, much to Ruby's unending disappointment.

Yang feeling glad that everything otherwise turned okay, grabbed her whining sister and gave her a tender pat on the back. "Ah, oh well... cheer up Ruby. At least I got a cool powerup! Come on, let's get the doctor and find the others."

Later that night, after debriefing with the headmaster over a mission accomplished, Team RWBY returned to their dorm for a night of rest and relaxation. Weiss and Blake were told of Yang's apparent new ability, and though they haven't seen it yet, they were kinda indifferent about it at the moment. A case of seeing it to judge it for them.

Personally, Yang simply laid in bed, staring up into the ceiling with a smile on her face.

"Grow bigger when I use my semblance now, huh? Heh... sounds like I'm about to have a lot of fun in the future..."

Yang yawned, beginning to feel drowsy.

"I hope I can control it... Pffft! Of course I can!" The blonde softly laughed to herself. Shortly afterward, she fell asleep, surrendering herself to dreams.