Saber, meanwhile, had doubts of his own as he threw out flurries of punches.
What conjuring trick is this? This Heroic Spirit’s even faster than he was before...!
He had no way of knowing, but when Lancer’s aura had changed a moment earlier, he had used his Transfiguration skill to lower his endurance and magical power by one rank each and boost his agility.
They were now equals in speed, but, as Lancer had not lowered his strength, his deft strikes were gradually pushing back Saber’s rapid blows.

Fate/Strange Fake: Volume 3, Chapter 8 ("Day 1, Afternoon")