Camel clutch and cross faces are submission holds that render the person helpless, and their feet are vulnerable to be tickled by anyone other than the person applying the hold. I have read a story here where a wrestler wins a championship using such a strategy. She applies the camel clutch on her opponent, and her ally on the outside tickles the person's bare feet after taking off the boots. The person caught in the hold can't speak up to the referee about it, since her mouth would be locked.
The 'Master Lock' exposes the armpits of the person caught in the hold, and can be easily exploited.