As Clay's Solar Beam approached Yuki and Elise ran towards her, the time seemed to pass slower than normal. Their apprehension just made it get worse.
'If my shot doesn't reach her before THAT happens, then it will be all for nothing… I need to do something about it. That's why this shot needs to be faster than anything. No matter how much "Willpower" I need to input on this spell, this beam will surpass any bounds!'
Clay knew exactly the terror of that spell. If Yuki was able to cast it, they wouldn't be able to beat her. That spell was feared for the most amazing Ascendants among the squadrons, and it matched her style completely.
The only weakness of that spell was the time that Yuki needed to cast it, but she probably passed the last years improving her skills so she could cast it faster than before. If that was the case, the spell got even more frightening.