Premise: "The boxer counters his opponent with a left hook."
Hypothesis: "The boxer is knocked out by his opponent."
Do we know that the hypothesis entailed by the premise? Now, let's be accurate as possible. Some thinking first:

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
A boxer cannot counter and be knocked out at the same time. So, the answer is no.