@hc - sorry for introducing the confusion :) This is kind of what I meant though. The guy who was the recipient of the "execution" appeared unaware that it was to happen at all, or, once explained, unaware it was going to be a fake execution. In that context, how could a mechanism to simulate blood spatter have been introduced, and why, given that the only close eye witnesses - close enough to appreciate the blood spatter - were not members of the other gang they were trying to convince?
I am being really pedantic, I know - but things like this bug me ;)