Woah, personal space was clearly not an issue then. The Master did't take to being closed in on like this and felt the need to re-establish himself as the more dominant of the pair, wanting to lead and not follow. Hence why he took a step closer to close in the gap, looking up at the Doctor with a sneer on his face.

"I told you, I just woke up here. I haven't seen anyone but you. And, honestly, I wish I hadn't seen you in the first place. You're just leading me on a wild goose chase instead of finding us a way out!"

And, before the Master could say any more, there was a terrible and really strange noise that ripped through the hallway, echoing out. It sounded like a scream but not quite. Like when metal dragged against metal. Only worse. He couldn't make out what it was but it was only there for a moment and then it stopped as soon as it had started.

The lights flickered once more and the Master looked up at the Doctor, baffled. "... What was that?"