Quote Originally Posted by Bushmaori
I got the feeling that when Sephiroth asked Cloud was was important to him Cloud only just then realised what he was fighting for and therefore fought to his utmost ability.
Agreed. With the amount of things that had happened in Clouds life combined with the massive amount of "Spirit Energy" he had, it combined into one hell of a "Limit Break-Omnislash", something that would defeat Sephiroth quite easily.

Cloud 2
Septhiroth 0