Logically speaking, if you are going to gun because you heard a noise (glass break or otherwise) you taking the time to make a 911 call is not going to be the first thing on your mind. Getting your gun up and either finding the noise or waiting for whoever to come up your way is going to be your priority. Not calling the police.
If you are go looking for someone talking on the phone isnt a priority, shooting someone or looking for targets is the top priority.
If you have a spouse, they should be making a call for you, calmly and quietly, making sure you tell your spouse the right things to say.
If you have kids your spouse should be getting them into a safe area and arming up. If it's just you then your priority are the kids and getting armed up, holding in a safe spot. Then and only then calling 911.
There is absolutely zero legal liability or issues which may arise from not calling the police until after a situation is over. If you wake up to glass break, or five dudes banging down your door and you go to the stairs with a firearm only to see them and start shooting there isn't anything illegal about that or not calling the police.
List of responsibilities during such an occurrence:
Get a gun up
Take a position of dominance
Secure assets (kids wife etc)
Use whatever reasonable force required to effectively stop the threat if one arises
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Call the police.