Ask Angela is just another, more discreet way to ask for help without alerting your 'companion'.
I do understand that, but the point I'm making is that there's an inherent flaw in the idea.
For it not to be likely to alert your companion, it needs to be a secret known only to a limited number of people.
But if it's known only to a limited number of people, then the number of people it helps will also be small.
I agree, helping a few people is better than helping no one.
But a previous poster made another valid point - if you are in a public bar, does it matter if your companion knows you are seeking assistance? He is unlikely to be able to attack you in a public place, and he will soon know you have 'asked for Angela' when security turns up.
If you're in a long-term abusive relationship, even if your partner hasn't come across the scheme, the reaction is likely to be 'who the fuck is Angela?' 'you don't know any Angelas' 'what are you on about, Angela has never worked here,' etc.