Perhaps it was because the attack of the Flying Swords was too fast, or perhaps the opponent's cultivation level was not high, but in any case, during the attack of the Flying Swords, the other party did not see it.
Additionally, the man who had been shouting just now was standing at the edge of the deck, so the others could only see his back and did not notice that the Flying Swords had slit his throat.
Therefore, they were unaware that before the man fell from the deck, he had already died due to his throat being cut by the Flying Swords.
At first, they were also startled by the man falling off the deck, and by the time they came to their senses and wanted to rescue him,
perhaps it was the blood spurting from his throat that attracted those creatures in the water. By the time they approached the deck, intending to dive in to save the man, all they saw was blood spreading on the surface of the water while the body of the man was being torn apart by those creatures in the water.