Cypher at least is a lot less effectuve when bound by the constraints of the actual rules and action economy!

Lamorak can still breath water for nearly 4 hours, I forgot to factor Typho into that spell earlier, but it might not drown straight away...They aren't that far under water, you could probably still charge one of them. A lance is piercing right? If so, it should work without penalty underwater (mad but there you go). If the ship doesn't sink Typho might be able to clean up the side to get out of the drink afterwards. Risky strategy though.