We'll see if that theory holds true for Crotas End hard mode. I'm predicting arc shields for Knights at least (particularly the boomers). If they don't have them then you're probably right about the shanks.
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I'm actually hoping they add shields to the boomers and make them a one shot, except make it a solar shield. Black Hammer would work well with that theory, and having to hit all 3 shots as critical so you could get the 4th shot in order to kill off at least 1 of them.