You would simply pass back and forth until someone decides to move. But if both players refuse to act I guess it would have to be declared a draw!
Viewing post in Motley Crews - Basic Rules and Cards comments
I think this should be specified in the rules. If the both players pass 2 times in a row, it's a draw. This makes it less advantageous for the player with more victory points to pass. The "2 times in a row" requirement ensures that the player can pass without fear of being caught by the opponent in a worse situation and resulting in a draw.