I played against 3 defender in trials running the bubble strategy on the capture point. They could maintain a bubble throughout the entire round. 3 Sunsingers with no super capable of killing them.
[spoiler]still 5-0'ed them[/spoiler]
English
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A sunsinger can spam enough grenades to drop a bubble (3 I think?)
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It sucked. They always found a way to screw themselves over though.
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It depends on which grenade though