It sounds as if a charge of attempted murder is warranted.
I think a prosecutor could get manslaughter when a critical patient dies, at least. That was a reckless act showing indifference to human life. Maybe even a higher charge to a non specific intent homicide.
Or at the least conspiracy for attempted manslaughter, or similar charge. I'm not a lawyer, but justice screams out in this case for charging each of the participants individually.
This case must set a precedent for not allowing stupidity or mental deficiency as a legal mitigation measure at trial. Or must random innocent victims die to clarify the stupidity of it all?