mock surrender

Hi,

What does ‘mock surrender’ mean?

The Vancouver Canucks tradition of “Towel Power” has its origins during the 1982 Stanley Cup Playoffs in a game against the Chicago Black Hawks, when Vancouver coach Roger Neilson, fed up with the performance of the officials in the game, placed a white towel on the end of a hockey stick and held it up like a white flag in mock surrender. Several Canucks players sitting on the bench followed suit, and Neilson was ejected from the game.
Regards.

Pretending to give up. Eugene has provided a nice example.