When you have a unit comprised of regular units, a character (sargeant) and Independant Character, how does getting into a challenge effect the rest of the fight.
One example is this, if you have urien, grots, and one is an aberation, and then for what ever reason (mind shackle scarabs) the aberation is in a challenge and needs to perform a leadership test, does he get to use Uriens?
Another example of my question is the vice versa, if say, the baron is in with some beasts and is challenged and he accepts, does that make it so the unit can no longer hit and run until after the challenge? also, can baron hit and run by himself and keep the beasts in combat?
Basically, does the character stop being part of the unit to accept the challenge or does he get to continue to buff the squad while in a challenge. I do believe that he still buffs the squad and the leadership test unless stating its against that specific model's leadership should get uriens.
Secondary question is, can you only challenge once per combat? I read in the rule book that "you can only challenge once per combat" so if you have a IC you don't want in combat you can just throw your sergeant in to get eaten or possibly just bog down their IC and then once dead he can't issue another challenge. I see alot of people going against this and issuing more than one challenge. Why is this?