Compel is a synonym of Subject. Subject is related to Investigation. Killing can cause/lead to Investigation. Killing requires Rage. 
Horn is part of Goat. Horn is related to Instrument. 
Compel <--Synonym--> Subject <--RelatedTo--> Investigation <--Causes-- Killing --HasPrerequisite--> Rage 
Goat <--PartOf-- Horn <--RelatedTo--> Instrument 