Premise: "A man is scalling a sheer rock face with a rope support."
Hypothesis: "The man is standing on his skateboard."
Do we know that the hypothesis entailed by the premise? Stream of thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
One cannot be scalling a rock and standing on a skateboard at the same time.
Therefore, the answer is no.