I will answer for myself now; I have taken a vow to reduce the amount of suffering in the world. First, I would try to talk to him, telling that if he dropped everything, I would let him go without calling the police (for example), and just try to coerce him into leaving in a non-violent way.

If that would not succeed, I would probably try and assault him in a way that could not have permanent consequences (physically, that is). Break a leg or an arm in the the worst case, something that will incapacitate him for the moment, but can be healed eventually.

I will not murder anyone for breaking into my house, I'm sorry.