Van Slyke used a question about where the Cardinals should bat Jason Heyward in their lineup to slam Mariners second baseman Robinson Cano .
Van Slyke was the Mariners ' first base coach the past two seasons .
Van Slyke , who was the Mariners ' first base coach the past two seasons , used a question about where the Cardinals should bat Jason Heyward in their lineup to slam Mariners second baseman Robinson Cano .