what detail is added to the weed story when george confines in slim?

This is when we find out about George and his petting fetish for all things soft including girls. Yes that sounds strange but some girls found Lennie cute in a big puppy dog kind of a way. When George gets a hold of something soft like hair he can't let go. Plenty of dead mice and puppies can attest to this. The girl panics and screams when Lennie will not let her go. Lennie panics and inadvertently kills her. The men in this ranch consider this rape or something sinister. The girl isn't dead but the men set out to lynch Lennie. That’s why George tells Slim that they were on the run.