Comment by LorenDB

> you can only bend the higher of the two notes in a hole

This only holds true if you don't count overbending.

Overbending works by forcing the "wrong" reed to play, e.g. forcing the draw reed to sound when you blow while the blow reed remains silent. Overbends nicely complement normal bends, but interestingly, overbends are a half-step higher than the highest reed in the hole.