Argument is a type of Summary. Argument would make you want to Walk. Stumble is a type of Walk. one thing you do when you Walking is Stumble. 
you are likely to find Drunk in/at/on Bar. Bar is related to Level. 
Summary <--IsA-- Argument --CausesDesire--> Walk <--IsA-- Stumble <--HasSubevent-- Walking 
Drunk --AtLocation--> Bar <--RelatedTo--> Level 