In this beginning we see Lennie going to Crooks part of the barn and Crooks demands Lennie to leave his room but he lets Lennie stay because Lennie wouldn't leave and then starts talking about if George leaves Lennie than what would Lennie do. We she Crooks power to be mentally strong.
After Crooks tells Lennie that he starts to show his size and strength to Crooks making his scared This shows Lennie's power of his physical strength.
Lastly Candy comes in and starts talking with Crooks and Lennie. What his power is that he's been working at the farm for a while and has money.