Well that exact thing happened back at the Feast of Blades GT when Kenny Boucher's Daemons fought a converted Adetpus Custodes army (counts as Grey Knights).
During the game Kenny's Bloodcrushers surrounded and cut off the Emperor (who I think was Draigo).
It made for an epic battle, and I'm not sure how it ended.
What do you think? Check out the scene below.
Who will win? -MBG
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