Yelling while defending?

[SMEngmann]

Gauge the reaction of the opponents. If you feel that it's causing a problem or is unsportsmanlike, address it with the players and/or the HC. If the problem persists, you can consider this baiting/taunting and call a technical foul. My suggestion, though, is to observe and use your feel for the game and the players before taking any action and make sure that action fits the game and makes it better. In other words, make sure an actual problem exists before you correct it or you could cause more problems.