Question mark on Change stance button?

[Beerigan]

Can't move one of my soldiers for some reason. I guess I need him to finish Chasing Shadows mission in the Road to Victory campaign.

It ends with the team regrouping at the checkpoint (plane).

One of my men got hit and is laying on the ground, but he's not dead. I can't interact at all with him. Theres also a strange question mark over the change stance button. How can I get this chicken up and running?