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So the book states that if an Abomination runs into a friendly unit in it's random movement during the movement phase, it causes impact hits and then backs up an inch. What happens if it breaks a unit in combat and then overruns into another friendly unit? Couldn't find anythign in the book that says it would cause impact hits to the friendly unit in the combat phase, but was curious what you'all think.

Right now I'm at school, but...

I'd say check the chariot entry in the WHFB Rulebook. I know it mentions something about chariots and impact hits when fleeing / over-running, and I'd assume the Abomination would work in a similar manner unless doing RAW and trying to avoid the impact hits on your own unit.

I'd say based on its a continuing move it does the impact hits then backs up an inch like a similar charge. However, the idea of above, and checking chariot rules is an excellent idea.

Nothing
The rules say that if it hits a friendly unit in the compusary phase it does impact hits.
Nothing about the overrun. So it follows the standard rules for an overrun (chariots don't do impact hits).