dulls fatugue

I looked down the slope of the pyramid. Hundreds of the Red Court were coming up, and they were tearing free of their flesh masks now, revealing the monsters beneath. Hold them? It would be suicide. The Swords gave their wielders immense power against things out of nightmares, but it didn't make them superhuman. Murphy and Sanya had both been fighting for twenty minutes - and there is no aerobic exercise that compares with the physical demands of combat. Both of them were breathing hard, growing tired.
Suicide.
But I needed to get up there.
"Dresden," Martin called. "Come on!"
I hadn't even realized he was shaking me, trying to get me up the stairs.
I guess I was getting pretty tired, too.
I narrowed my focus to Martin, to the stairs up, and tried to ignore the burning in my arms, my legs, my chest. I drew in a sharp breath, and it was like inhaling sudden cool, clean wind. I thought I heard someone whispering to me, something in a tongue I didn't understand - but I knew my queen's voice. I became aware that a cloud of white mist and vapor was gathering around me as I continued, a little faster, the humid air of the Yucatán boiling around the frost that had formed on my armor.
Then the cold washed away the hot fatigue, and I felt the ice flowing into me, implacable, merciless, relentless. My legs began to churn like the pistons of an engine. Suddenly one step per stride simply wasn't enough, and I started flying up them two at a time, rapidly leaving Martin behind.


Changes Chapter 47, Page 502-503