The other options I've seen is every man for himself. The relic holder can actually use a super shot on Atheon while everyone else stays spread out. This allows people to use rockets since the middle platform with all of the bubbles can limit their use.
I've seen all 3 methods work...
Everyone get to the middle
Portal team goes to the middle
Everyone do whatever they want (portal team has to get cleansed once they get out of the portal though, the middle platform takes care of this in the other two cases).
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