[thejeff]

No, I first noticed it a long time ago playing MA Man. In a huge battle a bunch of my Mothers got berserked, charged towards the front lines and survived long enough to pass out (thanks to Fog Warriors and Mass Regen). When they woke up they started casting again.
That's the only reason I noticed it. Suddenly spells were going off from the front line.

Mostly it just doesn't happen often. Berserkers who pass out usually just get killed. If it's an SC, they usually have enough reinvig to not pass out without an external source of fatigue, which doesn't go away .