I'm really loving this game with OXCE, and I am amazed at how modern much of it feels, but I don't understand how to deal with the UFO entrance doors. I'll set my soldiers up with plenty of TUs looking at the door, an alien comes out of it during their turn and shoots one of my soldiers dead before any of the others take a shot. It's really confusing why the alien gets the action priority here given the circumstances and means I am basically guaranteed to lose a soldier on every entrance

Any suggestions on how to deal with it?