Liu Mang wanted to rescue the man, but the river was too rapid; the man had long vanished and there was no hope for rescue.
Lu Mengyao didn't care about the life or death of that man. She didn't do anything amiss, so how could she have frightened someone into jumping into the river and committing suicide?
To have inadvertently scared someone to death, Lu Mengyao felt quite depressed.
Liu Mang looked towards the upstream of the river. The origins of that fellow were unknown, but he had muttered something about Zi You Valley, so it's likely he was washed down from the upstream of Zi You Valley.
Having exchanged a blow earlier, despite his injury, that man's martial skills were still impressive. It was evident that he was from the realm of the mysterious, and a master at that.
For someone like that to be so desperately fleeing Zi You Valley, it seemed that Sister Lin's words were not wrong at all - Zi You Valley must be very perilous.