That 18 year old women (child) must have been absolutely terrified- I bet her heart was jumping out from her chest- it’s clear to see from the video the officer barged in and started it when everyone was speaking but not shouting
Is it? On the Twitter video posted above or a different one? I've only watched the one above and there was nobody barging in (the police were already inside from the beginning of the clip).
The video starts with her being confrontational. Without seeing what happened before it's hard to say whether it's justified or not. In MOST cases this whole case would've amount to nothing if she'd been civil from the start so I'd say on balance, it's likely she brought it on herself. Some police officers are massive dicks looking for any excuse to wind people up and then arrest them, though, so it's possible this was one of those time.
Can't tell any of that from the video though.