Multiattack. The pirate can make three attacks, two with its sling, one with its hook.

Chain. Melee weapon attack: +5 to hit, reach 10 ft., one target. Hit: 7(1d8+3) Bludgeoning damage. Instead of dealing damage, the pirate can choose to attempt to trip its target. The creature must succeed on a DC 13 strength saving throw or be knocked prone.

Hook. Melee weapon attack: +5 to hit, reach 5ft., one target. Hit: 5(1d4+3) piercing damage. Instead of dealing damage the pirate can choose to attempt to disarm its target. The target must succeed on a DC 13 saving throw or drop a held item to its feet of the pirate's choosing.