Scar's screenshots when his jaw smacked doesn't have blood, perhaps as angry as Simba was he still didn't want to hurt his uncle? Perhaps because a (slight) fear of becoming a murderer… even if it by accident.
Great find. The first screenshot has got to hurt. I always thought the fiery hot ember background was supposed to disguise any blood that would naturally come from a lion-versus-lion fight.
It is predator versus predator. Would have been far bloodier if it wasn't Disney. Imagine how an anime version of TALK would have gone (think Wolf's Rain).