I am under the impression that if you have a clear enough view of the BG, you will be shooting directly at him.
Keeping in mind that you have the high ground and the advantage in this situation, you should see him first. Well aimed shots with the .45 will do him some bad, you know what I mean?
If you are intent on using MaDeuce, just be sure to aim the same way. The sound of cocking it should drive fear into anyone, but in case the message isn't clear, there needs to be some bang, and NOT just in the general direction, but directly at the general cause of your problem.
This will (hopefully) keep your son out of harm's way becasue I know that's a concern. A great, worthy concern. Be safe.