human
Write a detailed description of a dangerous scene outside a cliff with polypody ferns and a stone wall.
assistant
Water trickles slowly in patches down the face of the cliff, making it even more perilous to obtain a firm grasp for the climb. Polypody ferns grow thick and dangle leisurely from between any available crack in the stone wall, but quickly prove to be too frail to aid in the ascent whatsoever.