Ok so Moving forward: can you guys help me come up with a procedure when these things happen?
I want to send all my parents this new plan and perhaps it will help the parent that stayed regain her confidence in my abilities and show the other parents that I am now trying to be proactive should these situations arise in the future

I was thinking
first offence: long time out, serious talk, at arms length for the rest of the day (parents alerted immediately)
second offence: long time out, serious talk, arms length for the two days? (parents alerted immediately)

I don't know where to go from here. things of this serious nature do not happen often. Sticker charts don't really work when acts like this are random. I'd love to hear all imput to make this a really great procedure.