csl said:
The blood is supposed to be there. The entire scene is a homage to a scene in Kurosawa's Yojimbo (which plays out almost identically), which also cuts to a shot of a bloody arm.
If anyone has a copy of Yojimbo and didn't catch it when watching it or haven't watched it yet, it happens about 19 minutes in.
Interesting - i didn't know that. Yojimbo is a great movie. Definitely a must-see for anyone that hasn't seen it.