What am I supposed to do if the 2 guys next to me on my airplane are having a sword fight?

Bound from LHR > SLC. They have real swords. One has a spare one in his carry on.<br><br><br>EDIT: I have no idea why anyone assumes that my sword fight story is fake. Regardless, this is actually my real question. <br><br>What am I supposed to do if 2 people next to me are having a sword fight on an airplane?<br><br>I'm serious. I don't care if you think this is fake or not. I'm asking a real question. What should I do?