Leap over stab her with the dagger
From Create Your Own Story
Realizing you can, and should, end this in one attack, you mentally prepare your actions. Watch. Wait. Leap. Stab. 'Simple enough' You think, 'But I better end this with one shot'. Being in the water with a angry and potentially injured Squid girl is a very lethal proposition.Realizing that worrying won't change the outcome, you steady your mind. Quickly peeking out informs you that the Squid girl is almost within a distance you feel comfortable jumping. Dark as it may be, this isn't your first time leaping out to stab somebody. Going over everything in your head one more time, you stare into the eyes of your would be victim. Blue, like both her hair and tentacles. Drawing eyes a little lower, you can again appreciate her perky medium breasts. Focus! She's entering range...and...NOW!
You scrabble from your concealment and spring off the boat's railing towards the Squid girl. Feeling the rush of the air, time seems to slow as you approach. Dagger held high, you look forward to see the absolute terror in her eyes. You watch as tentacles rise to intercept you, but realize she is moving too slow to prevent your attack.
'Damn, I got on this boat to try and leave all this'
You could always miss. You'll be at major-major risk, but you could spare her. There's no guarantee she'll do the same however.