The following comes from a Reddit AMA with creative director Eric Holmes.

"Arkham Origins has really intense combat action. We're really pushing the edge of T for Teen with what we're doing. I don't think we could have pushed it further than we have without risking a rating bump."

The brutality of Batman's moves may not end with splurts of blood, but they sure do get the point across. I wouldn't want to take a punch from the Bat!