I suspect he thought there'd be trouble or was he was looking for it at the party. And that whoever he was to engage with was likely armed as well.
Nope, from what I heard from the mother of one of the kids who were shot - 4 shots in his leg and knee -trouble started after he went to back door to avoid being checked for weapons at the front door. Yes, I guess that's normal party protocol now..
He was denied entry and he and his crew forced their way in. After an altercation with several party goers he began shooting randomly. One of the older kids that was shot was also armed - legally I assume as there's no charges against him - nailed him four times in the chest. Didn't seem to be premeditated ... nor was it gang or beef related.
Random drunk stupidity .. guns, kids and alcohol ..
This didn't happen in the ghetto, it's in a predominantly white middle class neighborhood. They charged the mother who owned the property today.