Over the course of quite a while, I've noticed that the Paralysis spell never seems to trigger its knockdown effect against a telga orek. They can still be SHOVEd to the ground and even have colorful messaging for how they stand back up, so I don't think they're supposed to be immune to getting knocked down altogether. It's just that the spell conspicuously seems to never knock them down or get the "looks like it might just fall over" message for some reason. Something seems fishy.

Thanks,
-Life Weaver Karthor