The big blue crab happened to have its butt facing Hai Ling'er, so it was caught.
When Hai Ling'er pulled the crab out of its nest, the crab's large pincers were still waving wildly.
"This kind of big blue crab has a similar catching method to other crabs. One is to sneak attack when it's not paying attention, so that it doesn't escape! Another thing is to try to catch it from behind and grab its crab shell so that you won't be caught by its big pincers."
"This kind of big blue crab's pincers are especially strong. Not only can it make you bleed, but it might also hurt your tendons and bones. It's somewhat dangerous."
