If White does nothing, Black can try to kill the corner as follows:
Suppose White has fixed up her chain and Black filled the outside liberties, then Black can capture at 1 and the large white string is in atari. White can do nothing to prevent this.
If Black plays 1 here, White grabs the vital point. Black 3 prevents her from making two eyes but creates a bent four shape. White can capture them to create a living shape. The only thing to check is whether there are not some peculiar things in the corner:
Black can make an eye but White puts his stones into atari.
So nothing bad happens to White. ( is not even necessary; dies in gote)