It's funny because R2!Lelouch would probably totally get Fuuma, what he's doing and why, although he would still resent him for hurting Kamui. This Lelouch would probably be more into the seeking answers and trying to figure out if he's a person worth saving for Kamui. He actually wouldn't geass him. SHOCK! This is Kamui's fight, and he understands that.

And you need to elaborate on your answer, cheater. =P