Killing can be used for Violent. Violent is related to Protest. 
Attempt is related to Try. Try is related to Guess. Guess is a synonym of Hazard. Hazard is related to Threat. 
Killing --UsedFor--> Violent <--RelatedTo--> Protest 
Attempt <--RelatedTo--> Try <--RelatedTo--> Guess <--Synonym--> Hazard <--RelatedTo--> Threat 