really, the manga needed a thicker storyline, they really beefed up the game to make it more interesting to read. if it didnt happen in the game, its just for your entertainment
manga is only attached to the game by a very thin thread, and he probably studderrd when volvagias skull landed in front of him, because A GIANT FRIGGIN DRAGON HEAD JUST LANDED IN FRONT OF HIM!!!!!!!!!!!!!!!!!!