The context of the following conversation is Lee took pity on Kendall and helped him with the homework that was giving him trouble.:
Kendall says I owe Lee a big favour after what he did for me today..
The friend responds What did he do for you?.
Kendall responds He helped me get my homework done. I was having a hard time figuring out how to do it..
The friend responds Lee's great with schoolwork. He's always happy to help out..