"It is an adventure, but only death kept me company across all of it. I saw a myriad of wonderful and sanity-defying sights, but it doesn't offset the amount of disgrace and misery I have seen." So much death, so much destruction.
It made his heart bleed with depression. How many lives were lost, the ones he could have saved, and worse, the ones he couldn't save no matter what action he took in the past? The sheer hopelessness in it. The sheer pain of it.
All the faces of the dead, the poor people that died on their way to the park, or getting out of it. Those people he and James couldn't protect, too busy trying to stay alive and kill yet another goblin on their way.
The fight for survival was implacable, and so were its consequences. Those who died frozen without a shred of hope, or those who died brutally in hopes of bringing change for a better future. In a short while, he somehow saw all of it.