Responses
A I believe he can sense people's ability because he sensed the doc before he came around the corner and also the invisible dude in a previous chapter.
I think he just sensed his aura ^^
But I think his "ability" must be something like "instinct" ya know
Well, Sera didn't sense him, so that really shouldn't be it.
Saying it like that, it makes me think his ability could actually be "leeching" on others' abilities as he says he's not born with an ability of his own. He might be able to borrow it from another or even stealing from them like a leech... (just like Rogue from X-men or Peter Petrelli from Heroes)