"Why? Are you in need of a doctor?" He leaned in and looked deeply into Abe's eyes as if beginning to diagnose him on the spot, despite knowing next to nothing about him. Well, he might have been able to deduce a few things about the alien-like Abe, but he had just barely enough wisdom to keep his mouth closed.
"History," the Doctor scoffed. "I'm a Time Traveller. I visit history and invite it over for tea. Try me!"
He was interested in Abe. It wasn't often the Doctor saw something new, having a couple theories as to his origins but undecided.