“My nephew, radiant in his purple rain poncho, a canary yellow motorcycle helmet pushed down over the hood, stands under the eaves, rain rat-a-tat-tatting down from the roof onto the helmet. A duet with the drumming rain on my umbrella. Pausing a moment in the ankle-deep water, we listen to the call-and-response rhythm we make together. He laughs a great belly-laugh and roars off on his motorbike, the water a tall rooster-tail behind him.”—Mornings in Vietnam

2. the first sentence is a general statement about the nephew. How does the last sentence enrich and intensify the first?