[Fortunately, he does let go after a moment. Thor's a little paranoid when it comes to Loki. He's afraid he's going to just slip out from between his fingers in an instant, and then he'll never be able to find him again.]
The worst I would have to do would be create something artistic. [And that doesn't sound so bad to him, he liked Tony's punishment.] Still, with good fortunate, it won't come to that.