And then something moved toward them, and Valkyrie saw Skulduggery, shooting through the water like a torpedo. He was right beside them before the Hag even realized he was close.

[...]

She clutched Skulduggery tight, feeling the water part in front and boost them from behind. The Hag was after them, her body undulating as she gave chase, her face furious. She drew close and reached out, but Skulduggery veered, taking them into the murky depths of the lake, and then they rolled, changing course, heading back, passing right by the Hag, who screamed her rage in escaping bubbles.