Monsters and Prop/Body force

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Has anyone attempted to make a monster jump or send it flying across the map? I have, but AddPropForce and AddBodyForce doesn't seem to work. I figured that it could be due to the entity not having a "body," but adding a body to the monster in the model editor caused the monster to become invisible in game though it was still capable of following the path nodes and colliding with areas. I have a couple of ideas to get a similar effect, but has anyone attempted making a monster jump?