Kelsey pled the 5th and got an immunity deal.
She was arguing with Meg. Likelihood is they reached for the gun/had a scuffle and the shyt went off. Makes sense if Meg got hit with a bunch of bullet fragments
The alternative story is that everything was all good. They all left fully aware of their senses then Tory decided to cosplay as Neo and jumped over the car like Tom Cruise and said "dance bytch" aimed at a woman before letting off 3-5 rounds in a time window of seconds and the DA decided not to charge him with attempted murder somehow
You weigh the options and go with whatever seems more plausible
Just speculating and trying to make sense of things