In reply to Phil Anderson:
In which case we mean the same thing, we agree that behind you is away from the rock.
I can't help thinking most people see it this way too, that when facing something, it is in front of you, and that which is in the opposite direction is behind you.
Regardless of the frame of reference, if you consider the objects being referred to, rope + leg, my main point is that he has it one way in one sentence, setting up his frame of reference, but then says that he thinks a certain scenario needs warning about, but it doesn't, it is safe.
I split the section into 4 quotes.
The frame of reference for quote 2 + 3 is the way i perceive rope in spatial relationship to leg, but if author has it this way, then the quoted parts 1 + 2 are wrong.
However, if your spatial perception of this agrees with quote 1, it will also agree with 4, but then, if you pay attention to the detail of what object is in front/ behind which, you will have to agree that he is wrong about quoted parts 2+3.
Post edited at 18:42