Sometimes, one has to counter one's basic instinct and connect instead of hane.
This double keima-like shape is often seen, not only on the second and third lines.
When White plays , your basic instinct (hane against tsuke) may compel you to play a, making a tiger shape.
However, connecting with is generally better. Now Black can either take profit at a or c or jump to b. If instead ...
... he hanes, the atari forces an answer. After
-
, Black is forced into a low position.
Incidentally, is a keima connection, and another example of technique. For comparison, ...
If Black connects first, he will play rather than a (next diagram):
and
are submissive.
This is an example of tewari: the inversion of move order shows us something is wrong with the hane in the third diagram.