Leo: Premise: "Surfer surfs ahead of a crashing wave."
Hypothesis: "A surfer stands up quickly on his surfboard."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:

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
Not all surfer stands up quickly ahead of a crashing wave.
Thus, the answer is it is not possible to tell.