Always possible Trayvon lied to her rather than say he was going to hit the guy.
If she is lying it doesn’t amount to much of a lie it’s very little.
I suspect she is telling the truth as she heard it. Maybe the very last part is made up. My guess is no. Maybe Z was the one saying “get off, get off”.
I do think she may be drunk or high, maybe it’s just emotions. She isn’t making a lot of sense now.
Her 'bouncing' is what young children do when they are forced to SIT somewhere they do not want to be.