Fenn has blast. Very hard mish for Imps. I think it would be hard even if they didn't have to wound all the heroes, or at least balanced at that point. I played Rebs (Gaarkhan, Jyn, Diala, Fenn), it was too easy. Closed doors and slowed Vader up.

This is far from a slam dunk for the Imps. The rush forward strategy may not work as well (though Imps start exhausted, just as Han does). But it really doesn't make sense to rush forward anyway, as you know you have to bring Han back through whatever you ignored on the way in. I got a little lucky on crates, and had the ability to shut down an Imp unit for one turn, plus heals that could work on Han. I didn't open the doors by turn 3, led off turn 4 with Han using a double move, which then put him in range of Fenn's free move. He got that again in turn 5. He also got healed on turn 4. Combined with shutting down 2 Royal Guards for a turn, escape was fairly straight forward. Some luck? Sure. But this is far from "unwinnable".