Wow. Bottom line first. Every one went home in one piece and it only cost you $20. That's a win. I'm glad there was no more to physically carry hom than some bruises.
I've been in a parking lot, or two, and have found myself mulling over the sit for years afterward wondering what I could/would/should have done differently. Those personal debriefs have an awful high value, even considering the price/risk paid to get to them. What lessons did you learn?