They waste no time disrobing, grabbing the masks and snorkels from the pile and heading out into the water, steps careful on the rock pools and stones that crumble into easier-to-manage sand that is coarse beneath the soles of their feet. They explore the shallow waters, following each other around the cove. Draco sees schools of iridescent mullets, bright blue and yellow damselfish. Under the water, Harry points out an octopus moving lazily amongst the rocks.