Crooler has taken the Croc Command Ship to use for her escape. Laval has stowed away on the ship. As a jet ski crashes on the deck, assemble the pieces into a turret on the stern of the ship.
Climb into the turret and open fire on the Croc helicopter as it tries to attack you. Stop firing when the helicopter fires at you so your shields will protect you. Then when the enemy stops firing, it is your turn to return fire.
After Eris in her Eagle Interceptor takes care of the helicopter, crocodiles will leap onto the deck of the Command Ship. Defeat each of them in turn.
Once the crocodiles are defeated, Laval drops an anchor and brings the Command Ship to a halt. Switch to Cragger, drop down into the water, and sink to the bottom. Avoid the projectiles fired by the turret on the bottom of the Command Ship as you pick up the anchors holding the explosive mines in place. Carry them to a position directly under the Command Ship so the mines will float into it and blow up.
Bring the anchors of three mines to the indicated spot. When they all hit the Command Ship, it will be damaged enough so Laval can rescue Lagravis and add him to your party in the Lion category.