So my idea is pretty simple. If, during a battle, you feel your lord(Or hero) is at a severe disadvantage being mounted- In the sky vs a flying goon squad, only one left vs a group of halberds, etc- they should be able to permanently ditch their mount. Hop off and send it running off the battlefield for its own safety.
Its a realistic tactical element, should not apply to units that their entire functionality is being mounted (I.e. anything that isnt a lord or hero or comes in a mount-only flavor like tiqtaqto.who I assume has a disability and needs a raptor to get around) and is trading a value loss for a tactical gain- you still paid for that mount and the extra HP that came with it, and now you're going to have your HP proportionally scaled down and lose whatever battle advantages that particular mount gave you.
Something to consider, is all. Yes it makes counter-picking slightly weaker but it also makes being counter-picked slightly less unwinnable.
Feedback would be interesting and im assuming overwhelmingly negative, but I'd like to hear it anyway.
Edit: Included heroes and exceptions