First idea - Prime Arcee gets stuck working with Armada Starscream.
Arcee is of course extremely pissed, but is surprised when she realizes this Starscream actually has a code and some measure of integrity.
Starscream meanwhile is shocked and insulted by hearing what a preening cowardly jackass this other version of himself is like.
They eventually grow a tight bond
And then Starscream heroically sacrifices himself again and Arcee's trauma gets even further fucked
Another - because Elita 1 and Pointblank were the only Autobots released alongside a bunch of Con deluxe class figures, I'm imagining they wound up Legacy-Crossover-Portalling to the same spot, and have to work together to survive while surrounded on all sides