Scallops will stick to the pan when the crust hasn't fully formed. If your scallops are sticking, give them another 30 seconds. Wait until they easily release from the pan to flip. If you're worried about overcooking the scallops, cook them for just 30 seconds on the second side. It's better to get that beautiful crust on just one side and be perfectly cooked than to overcook the scallops.