I had to study this for a minute and look back…  Mark is not using the Commando Cody full body suit that Leslie Joyce provided- his legs are bare!  And have been for the last few “days” he has been under water… so Armed with the harpoon that narrowly missed him, his big plan is to commit murder- on people he doesn’t even know…  wow.  Vigilantism at its best, without regard for due-process or anything resembling an extended thought-process…

What a cold-hearted SOB you’ve become, Mark… poke, poke, stab, stab, and then what?  The Evil Yacht lies above, menacing your (fast) rental boat and its second mate… and I am guessing they might be somewhat put out once they realize that you have done away with their compliment of henchmen…