The answer is Agression , and violence.
The main difference between the two acts is not in the actions per se, but in Agression, the perpetrator may not really intended to harm others because his/her actions derived from their personal egos in order to appear as capable in order to increase their value. In violence on the other hands, the perpetrators tend to have a big intention to cause harms to their target.
This is where Lennie has gone back to that place by the river after he has killed Curley’s wife. Lennie expects that George will give him hell. he asks George if George is not going to do it. George says that he will not, but Lennie really wants him to.
I think this is definitely WHO because the story is talking about a certain unknown character.
