Kill it or let it play out?

[IRISHMAFIA]

It comes down to this:

Dead ball or not, the likelihood of a confrontation was high. Jawing or not, other than something similar to "That's enough, let's play ball" there is little else an umpire may or should do.

This issue is something the coaches should resolve, and quickly. If you have a coach that does anything, but attempt to stop it, s/he should be walking to the bus with the player.

And before anyone suggests that it would probably be safer to keep them in the dugout so that there is no confrontation away from the field, that isn't the umpire's job, responsibility or business. That is one of the reasons there should be a school administrator on site.