Then allow me to propose something else. You struck Ema Skye once after dealing with Shelley--a severe wound, but perhaps not immediately fatal. As you say, you seem to have little experience in killing humans.

She fled, naturally, and you followed. Either she lost consciousness from blood loss, or you struck again and finished her yourself.

...I bet you assumed the sharks would fall upon her like starving carnivores and leave no trace. You failed to consider that most such creatures are far more docile than some bloodthirsty beast, especially if raised in captivity.