Thief - Dual pistols.
Which is why I want the slot 1 skill to become a combination of your main-hand and off-hand. Most of the time the off-hand just hangs there when you kill something using only slot 1, makes it seem like dead-weight instead of the character actually utilizing it.
btw:
Yes it happens with all classes.
On normal attacks, your off-hand serves as dead-weight until you start utilizing slot 4 and 5. Thief being an exception where slot 3 becomes a combo of main- and off-hand.
I thought that might be the case with other classes. Even if the skill did same damage and effects, just had the animation for both weapons it would look and feel a whole lot better.