Dip the crab into shallow water where there is water and it will loosen its pincers. If you can't find water, you can also try placing the crab on a flat surface and it will also slowly loosen its pincers when you feel a supporting object.
The crab's pincers are a kind of self-defense and offensive weapon, and will not be used easily in its natural state. If you are caught in the pincer by accident, don't shake it too hard. The more you shake it, the tighter it gets, and the more you put the crab in the water, the more it will release its pincers.
Disinfecting the area where the crab's pincers have caught you and injecting you with the relevant injections is usually enough, and if the wound is large and deep, you will have to have it stitched up. Wounds pinched by crabs, if left unattended, may develop symptoms such as inflammation and even risk contracting tetanus, so it is important to seek medical attention promptly.
Expanded
How to catch crabs with bare hands so as not to be caught by the pincers:
1, first of all, you have to know what place there are crabs, generally crabs like to stay in the place where there is water and there are rocks, and the crabs like to hide in the cracks of the rocks when the tide is out.
2. It is best to catch crabs at night. Prepare flashlights and buckets and other equipment for crabs, when you see the crabs, do not get excited, slowly and gently approach it, otherwise it will scare away the crabs.
3, a hand against the back of the crab shell, and then instantaneous pressure it, or it will run away, some crabs run very fast, not paying attention to the disappearance. The back of the shell crab is pinched hands, so rest assured that the pressure, the intensity should be appropriate, not to let it run away and will not crush its shell.
4, after the pressure slowly changed to use both hands of the two thumbs pressure, left out of each finger open to the crab's large pincers to lean on its pincers tightly against it, and then you can pick it up.