Monkey Sergeant animations

The Monkey Sergeant boss summoned by the Vaal Temple circle exhibits multiple animation and telegraph issues:
- the slam channeling animation can begin before the boss model is rendered on screen;
- at times the boss remains completely stationary, as if frozen; it's inclear if this is just a visual issue or if it's actually not doing anything;
- the slam telegraph can rotate extremely rapidly (even ~180 degrees) mid-channel, seemingly snapping direction in a single frame.