The girls... as you said, if that happened. I can't tell you why they weren't charged. Maybe it didn't happen. Maybe he tripped over them, they checked on him with some of the brothers and they left the party because the brothers said they'd take care of him.But what about the girls who tripped him up (assuming this happened)? Shouldn't they have gotten help? Or, are they excused because it wasn't "their" house, even though they did the tripping? And, why does the guy who admitted that he knew that Piazza needed help get a free pass for not calling 911? Is he excused because someone else told him not to? Is that an actual excuse that you can use in a real courtroom?
What if Piazza himself said that he didn't need 911 after he fell?
I suspect the guy who "knew" is cooperating and probably has a deal with the prosecutors. Pretty standard.
Piazza was in no condition to assess his injuries, based on his BAC. And did he say that, if he did at all, after the first or second time he fell? Even if he said that initially, when his condition deteriorated, what then? When should the bells have gone off that he needed help?
We can go back and forth on this, but there's no point. Let's wait for more information. That said, I personally don't think it looks good for them. I'm hung up on discussions/texts that he needed help being ignored until it was too late. Maybe I'll be proven wrong.