The other crusher claw will hurt plenty but probably not draw blood. In any case, no one is going to lose a finger to a crab. Done right, the crab is helpless. There is no way to get you with his pinchers. If you do it wrong, you will know it right away.
Kids can be very proud of themselves when they learn how to pick up the crabs.
If you and your family enjoyed catching the crabs, it is not over yet. You will also enjoy the process of cooking and cleaning them. It is very educational at the same time. And finally, the real enjoyment comes when you open a cold beer and sit down to enjoy the flavor of the fresh crab meat. Some of the best things in life really are free or at least inexpensive.