Keep an eye on him until he does something naughty. Then I'd use my OWN personally owned arms to drop him before he hurts anyone else.
You DO own your own firearms don't you?
A number of them, and I load my own ammunition also.
Because of the temps in AZ and the fact we are half retired people/half drug route, many old people go walking in the early morning and they have shot more than one dog that attacked them (Pit bull mixes from all the druggies around here).
Not a big deal to see people walking around with guns here. Rifle or handgun. People in the other 56 have a hard time with that I guess.
...Boat accident... Etc. Etc.....