Purposeful striders lose their momentum. They don't so much walk as amble. They take on the investigatory zeal of a two-year-old examining each stray stick and leaf.
As the tide recedes they stroll along the beach, picking up clam, coquina and cockle shells. They study them, pocket them or put them in a bag.
If a storm has just moved through, they might find intact sand dollars, lovely pieces of ephemera that somehow last through time and tides.
Then again, they may find nothing much at all, just a few shells that are precious because of the walks they took to find them.