Walkthrough tips, Campaign discussion [Heroes 5: Hammers of Fate].

Guys, I need help. I think I have a bug in Campaign 2, Mission 3. I free Helmar, and he initially turns brown, but after a second, he turns into a purple player. The quest doesn't complete. I tried to get him to the surface, but he doesn't want to go; he stops at the exit and just stands there. Game version: 2.0. ADDED Thank you so much for your help. I am very grateful. I solved the problem with a patch. Thanks again for your help.