Forces Out Of Nowhere
As she floated further downstream in the river, she made frantic efforts to recover control of her navigation as best she could. The thirty meters of rope that were still attached to her became wrapped around a boulder that was lying at the bottom of the river at that point.
It seemed like it was going to pull her down beneath it.
It is unfathomable that she was able to conjure up enough strength to submerge herself and then extricate herself from the water. She was able to swim to the bank of the river, where she wrapped her arms around a boulder and used it to pull herself to safety. She was able to escape the danger. Furthermore, she had no choice but to just sit there and wait. On the other side, there was something else that was waiting for her.