Trick Plays used by high-dan players on KGS (2)

   'twoeye', 7d on KGS, uses trick plays quite often in his games, some of which invented by himself.

   Here he crushed a 7-dan when he chose a rare variation of a famous joseki (I added the usual joseki in the game file - White plays F3 instead of C5). After White 22 (C2), Black is expected to capture the stone with F2, but instead 'twoeye' tried a trick: he played B5. White resigned a few moves later...

   Do you know how to punish it?