I have one v 3 in a bubble and lived many times. Most of the time I go for suicide kills via grenade at my own feet in the center of the bubble and as many shotgun/melee combos as I can get before we all blow up or I die. Often I've just caught them off guard and killed them.
Even more so I die and damage the bubble and hurt all of them so the next teammate gets the kills.
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Yeah that's why I said if a defender knows how to use the bubble. If they pop one solo just time it right and you an kill with two shot shotgun. I do this usually, the slide with one or hec if they aren't facing you get em from behind always works.