The thing of it is, and this is just my opinion, when someone refuses to cooperate over a small thing, it's a sure sign there's something going on that's going to make the confrontation more difficult than otherwise.
She called multiple times. Not sure what the holdup was, but it took the second cop a loooooong time to get there. If you’re alone and the guy is not compliant and you have no way to handle it, let the guy go inside, take mom outside with you, isolate and contain the suspect, and wait for backup.