Resist the second peep
White peeps at both and and Black answers twice. Black's shape looks rather clumsy and his lump of stones can be further attacked, depending on surrounding conditions, at for example a or b. In this abstract case, Black's group remains rather strong, but still one feels White got too much with her two forcing moves and .
At closer inspection, only threatens to cut off two stones. resists. White cannot cut, because there is a ladder here.
If White stretches once and then cuts, Black is the one getting all the forcing moves and a nice strong wall, sacrificing two stones.
The more White stretches, the more interesting it becomes for Black to connect, as the marked stones gain importance by cutting an increasing White group.