OB, I am completely with you on this.
RobLev, what OB is saying is that it is your job, along with the coaches to both settle things down and assess the situation in an ongoing way. There is absolutely no need to pre-judge this now. You may all be masterful diplomats, the parents may be restrained and sensible and the whole thing a matter of isolated stupidity with no previous offences and huge remorse. There may or may not be relevant club officers present to help and pour additional cold official water on the problem.
To me the main thing is that the situation is dealt with, and that minimum disruption is caused to the kids if at all possible. Stupidity does not need to rule the day, common sense fairness and reason can be the winner, particularly in rugby.
The main message is, if something goes wrong, CALM IT DOWN, don't wind it up, Any talk of abandonment at an early stage of the incident is just ridiculous panic and will upset the kids and probably the parents. It is obviously totally over the top. Stupidity happens, calm it down!!
This isn't necessarily even an angry isolated idiot, in the case I saw it was just pure stupidity, the foot just went out, the regret and embarassment was immediate, every body else present was calmly horrified, the tripped player was fine, the facts were recorded, the idiot was led away to be dealt with, and the game continued.
Life then proceeded and a large ple of legal muck was tipped over the offender, end result - a lesson learnt.