it's either green or blue blood....definitly not red blood. But there are marines that either get killed or are already killed on the floor. They look like lifeless corpses (not too high in graphic detail)
I love this game, and I am never one to deprive a child of a video game. So as long as he understands the concept that he's shooting video game monsters, and not real life humans.
I would think it would be alright. I would recommend renting it and playing the first 2 levels yourself to see if it's suitable for them. It's ultimately a choice parents have to make for their particular child.
hahaha...A 6 and 10 yr old playing halo? I'm sorry but if u are like me and u play multiplayer a lot then u can't really imagine a 6yr old and 10 yr old kid being much of a challenge....besides little kids get frusterated and throw fits when they losse alot or get stuck in a level...they can play if they want too...just don't expect much out of them...