you are likely to find Air in/at/on Bridge. Air is related to Sound. Sound is related to Single. 
you are likely to find Conversation in/at/on Party. Person wants (to) Conversation. Killer is a type of Person. 
Bridge <--AtLocation-- Air <--RelatedTo--> Sound <--RelatedTo--> Single 
Party <--AtLocation-- Conversation <--Desires-- Person <--IsA-- Killer 