You'll see that this is exactly the same condition, only in the no-director condition they just have to remember to apply this somewhat arbitrary rule, whereas in the director condition, they have to remember to take into account the director's perspective in order to guide their ongoing behavior.
你会发现其实条件是完全一样的， 要记住没有引导员这一情况 只有规定的要求， 但在有引导员的情况下，他们则需要 考虑引导员的视野角度 这样才能理解引导员的指令。