Stinchcomb/Vilma Chemistry

Is it me, or did Stinchcomb seem to bristle at Vilma? Got off to a rough start with Vilma's ribbing about practicing against the O-Line, and I thought he was going to go full Jim Everett when Vilma called him Streif.
LOL! He called him Streif? As a joke or was it really just a slip up?