[b]ehind him were the shades of all manner of dog, half-wolves and wild wolves, urgent and prompting. . deep in the forest a call was sounding, . . mysteriously thrilling and luring, he felt compelled to turn his back upon the fire . . and to plunge into the forest, and on and on, he knew not where or why. . [a]s often as he gained the soft unbroken earth and the green shade, the love for john thornton drew him back to the fire again. —the call of the wild, jack london read the passage to visualize the scene. write a paragraph describing what you visualize and conclude about buck.