How exactly Purification protocol perk works?

Has a chance to immediately Annihilate any target deemed unworthy by M.O.T.H.E.R…

What does that mean exactly? In open world i saw some mobs instantly die, but does it do anything in group content?

Same thing in m+ for trash only. Ran it a few times but it doesnt proc often enough to make any noticeable difference.

What if everyone in group use it on some strong fortified pack of mobs? All trash or just weakest ones? I just hate how it doesn’t actually explain in game how it works, so annoying