Is it my turn to ask (again) for a knock back/down effect?
Yes, it is realistic (there's a video around of a woman being flung by a "small" elephant), and indeed it would be nice to have it, even when impacted by a cavalry charge, and certain spear/pike "formations" could reduce/cancel it (ideally from the frontal direction only).
It looks amazing!
I think what would be great is if a feature like this had some kind of knock down effect for foot soldiers. That way an elephant could run into units, know them over and deal them damage. The ones who aren't dead will then be able to get back up like the trample effect in Battle For Middle Earth.
Is it possible to integrate knockback and impact effects with units, like being hit by an elephant or struck by a catapult? The Hyrule Conquest mod has this, but it's a fantasy world; do you think it's realistic? (And the units in the mod have animations for being knocked up and falling; if this is implemented, more animations would probably be needed.)