I designed my build (by which I mean gave my mag some trigger action items) around this exact mechanic. Well, getting PB quickly, not necessarily using it as soon as I get it.
I slotted multiple invulnerability As on my mag because of how quickly I'll get PB back again. It's not unusual for me to get PB & trigger invuln A #1, use PB & katana combat right when it expires for another 20 seconds of invuln, then finish and get full PB and trigger another invuln A #2.
That's a lot of invulnerability if you do it right. More adds around when you finish = more damage dealt = more PB, so leave some adds alive specifically to kill with the finish. I've noticed PB fills more if you deal more damage in one blow than if you killed them individually (I also think it counts the full amount of damage you deal, even the overkill damage, so you get the full 100k damage worth towards your PB even if the enemy only has 9k hp).
What are you going to do about it?
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Wait. This isn't the campship...
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This place is so beautiful!
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Oh. It has an occupant.
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Sorry, buddy! You're being evicted.
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That hurt you more than it hurt me.
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All mine.
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