This would appear to be personification as it is giving human qualities to the Sun, even referring to the Sun as he.
In my POV, I think it's the opinion. Maybe......?
That Buck,learns the club of fang,like he witness Carly died by falling or slipping,then the husky go for the kill,and by the club he learned that the man with a club is the master of Buck when he striked Buck repeatly to make him the humans master him.