The Lagoon - the mercenaries' PT boat - is chased into a river by the military forces, which are chasing primarily in an attack helicopter. It seems the lightly-armed Lagoon has no chance against the helicopter, but Rokuro formulates a plan involving the boat's torpedoes and a partially-sunken ship lodged in the river canal. After defeating the helicopter, the Black Lagoon brings Rokuro to the realization that he has been written off by his former employer. He elects to stay with the mercenaries, who start to call him by the nickname 'Rock'. Written by
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So, Rock... What are you gonna do?
I am no longer held hostage by anyone, I have no place to go...
I have a friend that could need a sailor. Are you interested? They're messengers.
And they evade the law day after day, right?
[Rock joins to Black Lagoon
References The Wild Bunch