When you keep attacking a Crab, it might fight back. A yellow exclamation mark will appear above it to warn you, as shown in the image below.


Look! The Crab is now about to grab the Magic Pearl attached to the Card, as shown here.


Tap the Crab to stop it from breaking the Magic Pearl!

Note: The Crab has a chance to retaliate by breaking the Magic Stones attached to the Cards ONLY when it's in the back.