How did Krakauer feel when he realized Hall has died?

Krakauer was shocked..... filled with disbelief.

From the text:

With so many barely qualified climbers rushing to Everest these days, a lot of people believe that a tragedy of this size was overdue. But nobody imagined that an expedition led by Hall would be at the center of it. Hall ran the tightest, safest operation on the mountain. So what happened? How can it be explained, not only to the loved ones left behind, but to the public?

Pride surely had something to do with it. Hall had become so good at running climbers
of varying abilities up and down Everest that he may have become a little cocky. He'd
bragged on more than one occasion that he could get almost any reasonably fit person to
the summit, and his record seemed to support this. He'd also demonstrated a remarkable
ability to manage adversity.