Of the four champions, Fleur Delacour was the least prepared. Hogwarts winters were exceptionally harsh, and the lake water was freezing cold. After uncovering the Golden Egg's secret, she had not gone into the lake beforehand to gather information like the other champions had. As a result, Fleur had severely underestimated the difficulty of the second task.
Though the Bubble-Head Charm could indeed solve the problem of breathing underwater, Fleur ran into serious trouble the moment she entered the lake. The icy water left her limbs stiff and clumsy. Worse still, she had no idea where the merpeople had taken Gabrielle, nor did she even know there was such a place as a Merpeople village.
Yet her precious little sister Gabrielle was still at the bottom of the lake. Even if Fleur regretted not preparing more thoroughly, it was already too late.
Fleur knew she had to snatch Gabrielle back from the merpeople.
Enduring the discomfort of the biting cold water, Fleur used both arms and legs to swim desperately toward the lakebed.
Before long, someone with a shark's head swiftly passed her. It was Krum. Fleur recognized his swimming trunks.
Of course, that was also because Harry and Albert were wearing highly distinctive outfits.
Harry Potter was not slow either, following Krum as he swam deeper toward the bottom of the lake.
There!
Follow them.
They must know where the merpeople had taken the hostages.
After all, Krum often went into the water even in cold weather. He definitely would not know nothing.
It was as though Fleur had seized her last lifeline, and she swam frantically in the direction of the two boys. Yet no matter how desperately she swam, the gap between them only continued to widen. In the end, both Potter and Krum vanished from her