Are you sassing him? Cause he will knit you a doily to put all that sass on.

"Sure. Came to me a few days ago wanting to learn how to shoot. Gave him a few pointers." Jean might be jealous, but for Reiner teaching them separately was much easier. And safer. They were both completely green behind the ears when it came to handling guns of any kind, and this way he could give both his full attention. Rather than be distracted and have one fuck up while he was teaching the other.