I’ve made 911 calls before and I cant imagine going through that while trying to engage (or remain situationally aware) a bad guy who is in my house. I think focusing on a phone and not a lethal threat is a mistake. Have the wife call 911 while you handle the threat. I am all for controlling the situation then calling 911 versus having my attention occupied with an uncontrolled threat inside. Yes, there’s the risk of them taking the initiative and you’ve got no backup on the way but to me, it makes more sense to focus on one thing at a time. Not saying that’s the only way to do it, just my preference
Training classes are tools. Take the skills, put them in the tool box, and pull them out/use them in the manner and order you see fit. Adapting to the situation is critical