Would be hard to hear him, he;s on the roof during a thunder and lightning storm, not talking real loud (not every villain/bad guy yells with a booming voice) and he's more or less whispering to a bird, get's his powers in check after the freak out and goes on his merry way...sure quickly dispatching a demon could lead to some questioning but (and here's where my lack of knowledge on the subject might screw me) he might be able to say he's blessed??? Dunno if that's a thing, with faster reflexes and strength etc.. Like I said this is where my lack of knowledge will screw me over no doubt. Also Caim wasn;t really full demony, you just saw it within the flash of the lightning I guess that wasn't made completely clear.