[canadaump6]

There's a line somewhere, it's just a matter of where you draw it.
#22 swings hard, makes contact releases bat late, bat hits F2 in elbow. F2 has to leave game with possible broken bone.
Next time 22 is up similar scenario but this time bat hits you in the neck.
Defensive coach tells you he does not have a third catcher.
Your neck is already hurting and now you're risking being behind a novice catcher the rest of the day
Are you giving 22 a third at bat

Or better yet, 22 throws the bat and cripples the catcher at his first at bat, and at his second at bat, throws his bat which bounces off the back-up catcher, killing him instantly, and hits the pitcher causing a compound fracture of his left elbow, splintering and putting out his right eye.

These situations are proof of why I think an umpire should deal with the problem and eliminate any gray areas.