Sampling the Libraries air

 

You go back to the library with a jar and the fart is still lingering in the libary. You tell the libarian that you plan to take some a sample of the air to prove that the fart wasn't yours.

The librarian threatens to call the police if you don't leave and won't let you into the libary. What do you do?

Stay in the library to take a sample of the air

Leave

Hurt the librarian