Arnold's Doomed Hometown is struck without warning, and he never received the call beforehand. Arnold himself barely survives. Rather than lie forever in Wangst, he decides to join the epic quest that promises him a meaningful life, even though he never wanted adventure, at least not on the quest's terms.
Arnold has been told his whole life that he's The Chosen One. In spite his doubts, he's just come to accept that everyone expects it of him, so he tries to fulfill the roll just to please them.
Justified: Arnold has seen what happened to his friend Bob, who refused a similar call, and how Alice withered away in meaninglessness when she Missed the Call. He's also seen Charlie, who Jumped at the Call, get blown to pieces by being careless. He therefore has vowed not to make any decision regarding the Call without thinking it over first.
Discussed: "After that, Arnold knew he had two options: wallow in meaninglessness forever, or accept a life he didn't want, but never had the chance to reject outright. All his distractions were eliminated preemptively."
"Oh, whatever to do? Your friends and family were all nuked while you were away, and nobody thought to tell you until now. I don't suppose you could help us out? What else are you gonna do? It's not like you can avoid it anymore! You don't have to want this; just...understand that you need it." "Very well. Let's get it over with, shall we?"
The quest turns out to be more fun than he ever thought possible, and he can't understand why he ever was so cautious to begin with. In fact, he begins to love it a little TOO much.
Arnold accepts the call grudgingly, and his skepticism turns out to be right. The quest turns out to have been every bit as futile as he imagined, so he commits suicide.
Reconstructed: Arnold accepted the call grudgingly, but after being on his quest for a while, realized that it was as much a spiritual journey of growth as anything else. No matter how badly he fails or how much his skepticism proves to be true, he knows that no amount of failure can rob him of his new-found spiritual growth.