@Flavor25 If anything, healing being able to change appearance doesn't seem that far of a reach to me.
Healing to change people's memories/personalities on the other hand strikes me as just as absurd as things like killing intent, though. More so, even.
Anyways, killing intent auras or w/e are always stupid as shit, but I don't think it has anything to do with 'character's strength', detecting it seems like something mediocre at best people can do, the fact this particular dude noticed him from a distance was indicative of him being able to notice anything well, not his ability to notice killing intent specifically.