Ok, was down to just Chewy and my 5 man team + Ally.
Chewy goes full-on berserker mode and starts firing off 2-3 shots per turn, dispelling all debuffs (heal immunity & slow primarily), and giving himself taunt & heal. Oh, and his turn meter goes up so fast he does this every other turn. I finally hit auto since it was clear he was never going to die and watched him slowly whittle away my team.
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Oh, kill Lobot first, or you'll be sorry.
It's 5B that is impossible...for me now anyway.