I Googled "blood splatter" and came up with results like this, which would be very useful if I remembered anything from high school geometry. Basically, I have a scenario, and I'm wondering whether it is possible.
One character is chasing another down an alleyway. A shootout occurs. The types of guns they're using is up in the air—the first character usually goes for a Colt Anaconda; the other, in an attempt to fit in with the locals, is probably using a flintlock pistol or something equally ridiculous. The first character manages to hit the second in the shoulder—the shot is not immediately fatal (but can be eventually fatal, if arterial spray is the only way to go about it), and the victim manages to escape into his accomplice's coach.
Assuming the first character is close by, what are the chances that any blood gets on him? How close does he have to be to literally have blood on his hands?