Bell is related to Collar. Collar is a synonym of Arrest. Killing can cause/lead to Arrest. 
Safe is related to Valuable. Valuable is similar to Rich. Rich is related to Own. Own is a synonym of Acknowledge. 
Bell <--RelatedTo--> Collar <--Synonym--> Arrest <--Causes-- Killing 
Safe <--RelatedTo--> Valuable <--SimilarTo--> Rich <--RelatedTo--> Own <--Synonym--> Acknowledge 