The Doctor watched what he was doing every now and then, making sure to keep looking at the stranger, making eye contact. If indeed those strange colours were indeed his eyes or not some trick to make appearances.
Smiling still, he replied with smoothly, "I'm not the ship's Captain, no. This isn't my ship" he paused and took another step forward. "But this is my universe" he added with a sparkle in his eyes. It was strange how a man who looked so young could carry so much age and wisdom in a simple smile, and deep within those strange eyes, swirled a depth and mystery, a tragedy never revealed.
Straightening up, his smile fading, he started to slowly pace back and forth. "You're on the TARDIS" he said. "I'm not used to this one, it's not like mine, but still, it's trapped here, in this universe along with everyone else on board until I can find a way to get you all back" he rambled.