Two guys started debating a situation that occurred in my game. My unit was down to a Grandmaster on a Demigryph and Demigryph champion fighting a Bretonian infantry unit 10 wide. My champion accepted a challenge. My Grandmaster and Demi whiffed. When the Bretonian attacked back, the guy observing the game said the unengaged Bretonians who were on the other side of the champion (away from the Grandmaster), couldn't get their one attack each because the challenge was in the way so they had no way to 'wrap around' to get to the Grandmaster. I mean, it sounds logical, but I am not aware of GW limiting the unopposed combatants like that. Thoughts or rules quotes that might illuminate the situation?