If they find out after entering people are awake and armed, they're bailing out.
Better for them to "bail out" before coming through the front door. They won't even catch a charge if they do that.
Clearly, we aren't talking about the kind of people who "bail out", so I'll invite you to think on that a moment.
Respirators do not filter their exhaust. They protect the individual wearing the respirator. They do not protect the public. With one exception, your advice is nonsensical.
I wholeheartedly agree.