Diagram: bugcat (B) – BenKyo
Consider the meaning of the sequence A, B, C.
Black is trying to save the small three-strong group on the left, but the real object of White’s attack is the larger group of eight stones on the right.
This proverb is another way of talking about leaning attacks.
(Of course, at this level it’s not entirely that simple, since the reason Black is trying to save the three-stone group is in order to prevent the white stones from connecting to the bottom side.)