Walk away grab the heavy rocket or super them to oblivion when bubbles wear off. The thing is you can only beat their strat with a fully organized team that doesn't feed them kills to fuel supers. It's an easy strat to counter but requires team work which you aren't guaranteed in matchmaking play.
Basically the way for bungie to deal with this is private matchmaking.
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their bubbles don't wear off because they have infinite bubbled