I am not familiar with either of these critters but have seen the anemone crabs a few times. According to Hoover's book, the snail is nocturnal and is typically hidden in the sand during the day. Perhaps the snail was more concerned with getting buried and out of harms way than tucking away while exposed?

Hi Tibbi S, If you mean the crab when he picked it up... maybe it's because the crab is too big for it's current shell and can't withdraw inside of it, and why it was so determined to evict the snail from it's shell. Just a guess. The housing market is fierce in that neighborhood, it's a sellers market. :) The crab probably offered to leave behind a couple of Jeweled Anemones too. :) This is why divers ought not remove empty shells as souvenirs. Thanks again for sharing your awesome footage!