ok your going to have to do this the old fashion way. iv caught many crabs this way in the ocean. its called a drop line lol. simply tie a big piece of food to a string and when he grabs it pull it up very slowly. your going to have to do it in the dark. crabs in the ocean are just as dumb (or smart) as yours. might as well try it. it only takes 2 seconds.
if this doesnt work tank a metal barbicue scwer and jam it into the hole he lives in... tehn stick him in some lemon juice and put him on the grill
if this doesnt work tank a metal barbicue scwer and jam it into the hole he lives in... tehn stick him in some lemon juice and put him on the grill


