Just got my BRB out to double check.
Yeah, there's actually nothing to prevent those not involved in a challenge from attacking the other challenger.
Looking at the rules a bit more closely, the only real benefit to Look Out, Sir! is the removal of Look Out, Sir (but as a double edged sword, you lose it too). It seems to me that it was intended to prevent something from just running solo and tanking an entire unit by issuing a challenge so it only has to face characters one at a time - but that's a none-problem by a) the person not accepting that challenge and b) not forcing particular armies to issue/accept challenges, c) not having units full of characters and d) Allow targeted challenges (i.e target has to accept), but allow the targeted character to make an Heroic Intervention style thing to nominate another character or to avoid the attack, and remove this "all may attack" rubbish - defeats the entire idea of "challenge".
My idea would be to change it so that;
I.e Space Marine Captain is charged by Jain Zar and a squad of Banshee's. A Captain issues a challenge to the Aspect Warrior Exarch, which the exarch may choose to either accept, nominate another character to make the challenge (making an Initiative check), or refuse a challenge - in which case it must take an Initiative check (on its own initiative) to attempt to avoid the attack.
Maybe include rules for Charging allowing a reroll of Initiative tests when you are challenged by a charged model, while should the charged model have the Counter Attack special rule, then the reroll could be negated. There could also be an inherent bonus in that you get a bonus to the roll based on who has the highest Initiative, equal to the difference between them. I.e a Space Marine Captain is charged by the above example, then the Exarch may need to pass their Initiative check 6, against the Space Marine Captain (5), but if they were to nominate Jain Zar to accept the challenge, although they'd take the test against Initiative 6, it would be with a +2, rather than a +1 thanks to Jain Zar's Initiative of 7. Against Orks, however, an Ork Warboss in a Shoota Boy squad charged by the captain and having a challenge issued against him could nominate an Ork Nob to take his place - although testing on the warbosses initiative (4?), it would suffer a -2 thanks to the Nobz initiative of 3 versus the captain's 5. It would be on modified Initiative too.
If you're diving into an assault, then you're doing so for a reason. If you didn't want to be in an assault, then you shouldn't have been part of a unit to do so.
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