Side Pass The Biscuit Please

I rode Monday in the arena.  We worked again on side passing.  Biscuit did a great job.  Once he had a melt down - he kinda crow hopped a little bit, shaking his head to let me know he was DONE with side passing.  I am sorry to say I jerked his mouth some.  I instantly felt bad and realized that doesn't help in the least.  DUMB OWNER syndrome.  We rode for an hour.  Allison said she had worked on leg yields but not side passing.  He seems to understand turning on the haunches but he goes at it too fast.  Will work on slowing that down.  He was a pleasure to ride.