In the instrumental killing the murderer is prepared, armed, but it was not the goal, killing occurs only if necessary to achieve the goal - getting the money in a robbery, for example.

在工具性谋杀中，杀人者是有准备的，全副武装，但是杀人却不是目的，杀人只发生在为达到目的而不得不采取的行动，比如，抢劫钱财。

youdao

If so, would it be moral to try to mislead the murderer without actually lying?

如果是，那么没有实际说谎但误导了杀人者，这会是道德的吗？

youdao

"Against anyone taking the law into his own hands to kill the perpetrator of a capital crime." (Numbers 35:12 "the murderer shall not die until he stands before the congregation in judgement.")

任何人不可以执法为由私自杀死重罪犯人。(民数记35：12“杀人者不可死，直至他站在会众面前受审判。”)

youdao