I agree with Sue, binding is not always the answer. And with doing a binding there is always the chance of backfire and finding yourself bound to the person you are trying to bind., which can cause all sorts of problems.
The first step in a situation like this is to use mundane means, such as police, etc to keep this person from harming anyone.
The second step would be a protection spell around the person who is being hurt to prevent anyone from doing them harm.
Only as a last resort, and if the first two steps failed utterly would I consider a binding