Question: Why did Norrington let Jack escape?
MikeH
Answer: At no point did he actually "let" him escape on purpose. Jack was always just too witty for Norrington (who is kinda slow). That's counting 3 occasions where Norrington failed to capture Jack, but perhaps you can be more specific as to which escape you are referring to.
Answer: In addition to the other reasons mentioned, Governor Swann suggests it, and not wanting to cross him may have contributed to Norrington's decision.
Answer: He lets Jack go and decides to give him a one day head start before pursuing him again out of affection for Elizabeth, whom along with Will wanted Jack to be spared from execution for his good deeds.
Phaneron ★