This shows imagery because it paints a picture in your mind of Walt hunting and him by the fire with his dog and his gun.
Walt saw the wedding of the trapper and the bride was a "red girl". This symbolizes a native american or person of another ethnicity. This shows realist ideas by calling the bride and her family "red", this shows the unfiltered writing style of the realists.
A slave end up at Walts house and Walt helps out the slave by feeding him, giving him fresh clothes, and letting him stay with him for as long as he wants. this shows the theme that is: accepting others brings out other peoples true kindness