human
Produce a detailed written description of a gloomy scene outside a canyon with thorn-bedecked vines.
assistant
The northern wall of the canyon here is almost completely obscured by the thorn-bedecked vines. Even if the rocky wall was strong enough to support weight without showering a spray of pebbles (and the climber) to the parched earth, the blades of the vines would make any attempt at scaling the wall an impossibility.