Chased by the tide

The tide was on the turn as l arrived at Pegwell Bay, l was astonished at how dry the upper tidal area was although l should not have been after months of little to no rain and the high temperatures that have been our companion this summer. I was watching what l thought was a dead crab marooned in the mud when l realised the tide was up to my shoes, l walked smartly but the tide matched me until l jumped onto the bank.
Extra is of the crab, which moved when covered with water- a calculated reprieve?