Started Act III Part 1, Attacks on Multiple Axes, and died, so obviously I hit restart. But when I restarted, my units will not exit the helicopter. They sit there until they're all killed by enemies, even if I order them to move. Then when they're all dead, the heli flies away. The first time I started the mission, they all exited the chopper and everything was good. Now they will not move and I will have to do the mission on my own..?