Okay, who here has actually played ball at any sort of level? When contesting a shot, you arms are usually at an angle in front of your body because the last thing you want is body contact with the player whose shot you're trying to swat. In this situation, the only way a shooter can land on your foot is if they jump into you, then I think it's the shooter's problem.
What I've seen Bruce do is step towards a shooter who has gone straight up after the shooter is in the air, thus increasing the chance that the shooter will come down on his foot. Personally, I think he's done this with the intention of defense, not injury. However, he doesn't need to do it because by the time he does the shot is usually already away, and he increases his chances of being called for a foul.