As soon as you're ready, mix the seafood again to make sure you have a nice coating of oil and then work quickly to place the shrimp and then the scallops quickly on the grill. Don't move or fuss with them once they are down, as you want a nice sear and some grill marks. Use a basting brush or spoon to distribute the remaining flavored oil on top of the shrimp and scallops. Turn the seafood once and continue to cook until just cooked through.
Grill your bread and serve it along side the seafood and garlic-herb oil.