My team did the Left Left Right Right strategy. We had both banks full. Boss calls for left side (blue/white side) and we tether to him. The point of the tether was me and I was literally jumping into the blue cross while attached to all of my teammates because for some reason the tether wouldn't attach to the cross.
There is no reason that I know of besides that there is a glitch in the game that registered our full bank as not full. The bank was glowing the blue with pieces of red to indicate that it was full.
Please fix this. I took a video and can send it through Xbox Messenger.
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If the tether does not connect to the boss, it usually means there has been a sacrifice at that bank so its not full. You can tell its not full if the enemies still have shields and go to the relay.