Jonas closed his eyes again. He took a deep breath and sought the sled and the hill and the snow in his consciousness. There they were, with no effort. He was again sitting in that whirling world of snowflakes, atop the hill. Jonas grinned with delight, and blew his own steamy breath into view. Then, as he had been instructed, he looked down. ... He saw his legs, and moved them aside for a glimpse of the sled beneath. Dumbfounded, he stared at it.
There are no more uses of "dumbfounded" in the book.