This is so important. The one house party I ever went to (an 18th on NYE) yes at the time I was probably annoying but anyone that had done exactly what Hannah did I made sure they were on their side! Luckily there were people there that thought a like. So I wasn't the only "crazy one" saving people's lives!
Something that I've learnt is that people don't usually call for medical help when people need it because they're scared that they'd be reported to the police, but for your information, police will only be dispatched if anyone's life is put in danger (i.e. if they're being attacked), sad to hear that they don't call for help and as a result the risk of death due to not receiving medical attention is higher.