An amused smirk settles onto Jack's face as he approaches closer. "So, you did catch me. Not exactly built for stealth here." He gestures to the plate armor that he's wearing.

"I'm Jack Harkness. Technically Captain Jack Harkness, but I don't know how much my commission extends here." Jack's tone stays casual, but his eyes keep searching the man, as if trying to absorb every detail. What's so different about this Hero, in particular?