It was the most strangest pvp glitch I saw, I was sure I was dead.
Update: people he still had health before he hit the wall and died, how did he go flying like that ?
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Had it happen to me a few time. Popping the bubble triggers health regen. So he was healing when you hit him. Chances are he had armor of light which gives the overshield only when he is in the bubble. By pushing him out of the bubble you negated the over shield and he died from fall damage when he hit the wall at high speed. Funny, really, destiny and those wonky physics