How does Tobias Wolff use imagery in Say Yes?

The story is quite short and straightforward, yet it still contains a few important images. When the husband squeezes Ann's injured thumb, "a single drop of blood welled up, trembling and bright, and fell to the floor"; this drop of blood stands for the tears that Ann does not shed. When the husband goes outside, he sees two "mutts" who live down the street knocking over his garbage can. The dogs, who are not fighting, still are portrayed with an edge of violence: "One of them was rolling around on his back, and the other had caught something in her mouth. Growling, she topped it into the air, leaped up and caught it, growled again and whipped her head from side to side." The controlled intensity of the scene mimics the one that has just taken place between the husband and the wife. The husband seems to recognize this truth, for instead of heaving rocks at them, like he usually does, he lets them go away unharmed.