Watermelon Gazpacho with Shrimp

Name: Watermelon Gazpacho with Shrimp
Ingredients: 1/2 loaf country bread (about 8 ounces); 6 cups chopped cold seedless watermelon, plus 1/2 cup diced; 1 bunch scallions (1 chopped; remaining whole and trimmed); 1 large tomato, diced; 1 Persian cucumber, diced; 1 jalapeno pepper, diced (remove seeds for less heat); 1/3 cup plus 2 tablespoons extra-virgin olive oil, plus more for brushing and drizzling; Juice of 2 limes, plus wedges for serving; 1/4 cup roughly chopped fresh mint; Kosher salt and freshly ground pepper; 1 pound large shrimp, peeled and deveined (tails left intact); 1 clove garlic, minced