Kaidan sees nothing overtly wrong here. Sure, horned humans are not the norm, but who's to say this guy is human? Assumptions make asses out of everyone and coming from a place where humanoid species are common, there's no point in bringing attention to features that can't be changed in less than five minutes.

Or so he was taught while growing up. Be polite.

"What you need?" More than heartbeats—Kaidan crackles like a generator, doing his best to suppress the havoc the ambient lighting plays with his biotics and somewhat succeeded. Luckily, this man appears to be blind, thus likely unbothered by his bioluminescence. "Engine block, right?"