It drove me absolutely insane when they introduced human shields into warzone and gave it the worst controls system for it, for the love of god just let me quick melee them and hold the button if I want to shield them. Absolutely infuriating when your were dry on magazines and another team mate was coming.
I think they improved it this year by making it so it only shields up if you melee them from behind but it can still happen by accident like here.
This was in casual of course, first enemy was human and 2 and 3 were likely bots. I was using the Taq-M to grind for platinum which is easy but pretty slow in casuals.