Check Swing Mechanic

[gsf23]

This weekend watching the Cubs and Rockies play, I saw a strange new mechanic. Angel Hernandez was behind the plate and whenever there was a check swing, and Angel called it, he would point at the batter with his left hand and then twirl his right hand around over his head like he was twirling a lasso. The first time I saw him do it I was just like "what the hell was that??" but then he did it about 4 more times throughout the game. Anyone else see this and what did you think of it??