: ( 301)
Black cuts inside White's formation.

:
White should block from the right to pre-empt Black's forcing moves here, which also take important liberties.

: (92 304)
Black reverts to the main line of this chapter. He cannot give atari from below with a move at , instead.
As you can see from a sub-variation shown earlier ( 93), it will not help Black either to strive for a more solid shape in the corner with a move at .