The first thing the Master noticed when he awoke was that his surroundings didn't even begin to resemble the interior of a gaudy ring. What was even more worrying, though, was that they also failed to resemble the cockpit of the warp ship he had hidden in the secret bunker under his country home. This ruled out the successful completion of Plans B and C, and as he hadn't had a Plan D, this was of rather great concern to him.
The second thing the Master noticed, after having spent a few minutes looking around at the hideous wallpaper and the cheap-looking furniture of the bedroom in which he found himself, was that a rather poorly made teddy bear had been tucked into bed with him. He pulled it out from under the covers and threw it across the room before sitting up and swinging his legs off the side of the bed. He felt lightheaded when he stood up, but considering the fact that he had been shot, waking up in the same body with only a bit of dizziness was an astounding lack of consequences.
The third thing the Master noticed was that one entire side of the room was fenced off with a wall of tightly knit chain link material from floor to ceiling that blocked off the normal wall behind it. There was a crack in the floor and the other walls just past where they were blocked off by the mesh, but nothing to indicate why the Doctor (the Master had come to the conclusion that wherever he was, the Doctor was responsible—the alternative, that there was more than one being in the universe who would tuck the Master into bed with a teddy bear while he was unconscious, did not bear thinking about) would want to forbid him access to one of the walls.
The fourth thing the Master noticed, when he went to get some water, was that the fixtures in the bathroom he found adjoining the room in which he had awoken were not connected to any plumbing. Even stranger, they appeared to be solid chunks of plastic, precluding any possibility of the faucets ever having functioned in the first place. He broke one of the faucet handles off of the sink, more out of annoyance than any belief that it would improve the increasingly bizarre situation in which he found himself, before going back out into the bedroom. He had seen a door to another room earlier, and steered toward that.
Just then, though, the entire house gave a little shake and the wall behind the mesh began to fall—no, swing—away, leaving an entire side of the room open to the outside but for the chain link still in place. The Master boggled as the Doctor, his face as tall as the Master's body, hove into view. The Doctor grinned, a sappy look in his eyes, and the Master felt a little sick.
That was probably because he'd just realized that he was standing inside a dollhouse.