My friend wants to throw a vial of rubidium into my classroom
My friend is pretty much a psycho and does a lot of messed up stuff, we take chemistry together and he just likes to screw around with chemicals, the alkali metal rubidium is extremely explosive when it comes in contact with water and explosions can kill within 50m, my friend stole a vial of it from Nottingham university when we visited there for a trip, a 30 gram vial, he says he'll throw it on The ground in chemistry next Wednesday, he has no clue what this could do, he could literally take out half the school with 30 grams, I tried taking it off him but he says if I try to he'll throw it, I'm really worried, I got in trouble from the police when I said he had it, they said no way a student could get rubidium. What the hell should I do?