Not sure actually. I think they are something like a cutscene when you walk into certain rooms where a monster is going to kill a friendly soldier and if you save him he joins you. In the JPN one you'll just walk into the room and see the enemy + guy and if you save him he'll join you...aka, no cutscene. I have a JPN system though so this is just going from what others have told me.
That being said, even without the blood/hero scenes, myself, DCharlie, Thetrin, and a few others absolutely loved Resistance and I don't feel the lack of red splats detracted from the game at all (since you're fighting monsters, not people). But....I do worry that some future games like RE titles will be missing headshots and things actually important :\