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Henchmen are removed instead of Wounded, so there shouldn't be any knockback.Unless they're armored, I guess, but I haven't run into that yet.I guess I would apply it only to the individual that would logically take the Wound.
Well, in many comics I have seen superheroes with a single punch send hordes of henchmen flying and knocked to the ground so I would allow a "knockback" per the normal rules, though perhaps reducing this distance to one-half might be reasonable.
If you were to reduce the number of figures in the group to 5, then give every figure 2 Wounds, you could do it. But then you're tracking wounds on individual henchmen, and that may or may not be something you want to do.