Oh please, all dogs if they are not expecting it, are going to take a moment or two to change gears, even attack trained dogs with a bad attitude. They aren’t machines.
Boy howdy, you don’t know dogs very well, do you.
Just curious but are your dogs deaf or blind, cause my dogs hear people long before they even get near the fence and start barking (which would stop most idiots from even attempting to try the run across the yard).
If anyone did drop over the fence they would promptly be mobbed and gang tackled at best by the pack. I can’t flat rule out any biting.