the man and the woman in the picture are doing a circus act.  the man is in the process of catching the woman while he swings.  the woman is confident that the man would catch her without fail because he has done it so many times.  the man is rather anxious because he doesn't want anything bad to happened to the woman incase his hands should slip.  as much as the woman trusts the man's abilities, the man has low confidence in them.  he would rather put his life on the hands of the woman than the other way around.  
