You only scaled the skeleton (fs_troll) and not replace any animation, correct?

Scaling the skeleton SHOULD scale all the animations in it. The animations are not scaled individually, they're controlled by the skeleton.

RTW/BI does have a bug in some animations. Like if you killed a slow_swordsman (or slow_anything) while running, the death animation will result in them 'collapsing' aka the bones are shrinking.