We've always had to exit the safety of our bubbles to shoot our enemies, or wait for them to try to kill us from inside. But what if we didn't have to, how would that affect the game?
Edit: Suggestions say that there should be an Exotic armor/weapon that has this ability exclusively. Nice.
Also considerable: Switch that with being unseen from outside the bubble. It'd be harder to kill the Defender if you try to rush them.
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How about this - an exo armor that grants: Friendly fire can pass through bubble, but 50% of damage is applied to the bubble, and 50% to the target. Bubble collapses when its HP are done. So the more you take advantage of it, the shorter the bubble lasts, and no OHK's from inside a bubble due to 50% nerf. Also, if using power weapons inside the bubble, it will collapse faster still.