Any doubt was gone when she started signing. He thought that she would get a clue but when she didn't stop, he just grabbed her wrists and held tight.
"Stop. One, I don't know what you're saying. Two, you don't know if someone else can't read sign language. You aren't helping. You're making things worse, so now, if you'd like to talk fine. If you are intent in proving that you are stupid, you will have to do it without me. Now, slow down and talk to me."