Softlocked by Reinforcements

During a retrieval mission, my squad set up overwatch on a door that the reinforcements were indicated as arriving from. Because AI appears to be programmed to avoid walking into player overwatch zones, the reinforcements did not leave the door, making them untargetable. Notably, this particular retrieval mission has a win condition of "eliminate all enemies" rather than an extraction, which is why this has soft-locked me. 

Additionally, because this was near the end of the mission, I do not have any AoE utility items or advantage points to utilize in a way that would allow me to defeat the enemies through the wall.

I am playing on Expert difficulty, with Beskar mode enabled, so I am unable to restart or end the mission.