Beat the challenge the other day. Had 3 titans. Two stayed in the middle. The other hoped on first plated. Use his bubble there in case he got overwhelmed by adds. But you should unlock it for the other might not have their supers. Always be ready to step in guardian.
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Why would he need it on the plate? In hard mode there are sweet spots on the plates that let you kill your knights and not be attacked from what spawns. I'm just saying if it's done right, he won't need to use it and it should be saved for the bubble encounter or what ever it's called when you get pulled in.
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He really only used it if he did something stupid lol. Most of the time he was ok