And for most of those who are, I wouldn't advice looking them in the eye. Them be the reasons mama said not to talk to strangers.
I would say a small spurt will be ok. Take a look at the colour and gash of the blood in Letters from Iwo Jima, then reduce that amount to make it enough to see from range, but only just. You should be able to get the satisfaction from a headshot by seeing blood, and other parts should also have some spurt for the same feedback affect. But it wont' be a cloud, nor will it be some drip-drip effect, and definitely not bubbles like that in FH1