The other reason the second bolt misses is that the orc tumbles off the deck of the tender and into the water with the first shot. The tiny plasmoid vanishes, oozing into some crevice of the tender.
Spoiler: Perception 10+
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At the same time, you can hear muffled orcish voices and the clang of boots on the metal on the derrick above; they pick up speed as the orc on the tender cuts off mid-sentence.
Pressing a finger to his lips, Cocytus seizes the oars and maneuvers the jolly boat to hide behind the ramp. He drags the corpse behind the ramp with you, which is unpleasant for everyone in the boat but hopefully covers your tracks. The orc's (weapon? tool?) stick doesn't seem to be very dangerous, just a brief jolt of non-lethal damage.
Spoiler: Summary
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The additional orcs need 3 rounds of movement to get to you; you can take up to 3 actions out of sequence here until they show up.
INITIATIVE
17 - More Orcs
16 - Fork
15 - Plasmoid
11 - Cocytus
8 - Nibum
4 - Ttharg
2 - Servius