Baby monitor.... good idea.
Go and batter them..... very bad idea. Ring the police and wait.
If the bike gets nicked it's a lot better than......
1. You have the baseball bat taken off you and get battered yourself.
2. They shoot you in the head.
3. You batter them and go to jail.
It's not worth dying for a motorbike, sorry to those who disagree but it really isn't.
By the time police come theyl be braying the bike up the road and be gone... what you do is ring the police and say your being robbed or what not , then wait couple of mins , ring them again and tell them it doesnt matter youve shot the b*****s and youl have a full swat team turn up .