Does your hero have a weapon equipped (it may have broke)? Are both characters selected when you click on Fergus to attack? If you pause the game, does that help with targeting?
Did you explore the other cells, and get to level 2 before reaching Fergus? If so, where did you put your stat points? For level 2 I raised the Strength of both to 6, left Intelligence at 1 and raised everything else to 3. Survival and Speed help.
