Counter is a synonym of Anticipate. Anticipate is a synonym of Look. Look is related to Investigation. Killing can cause/lead to Investigation. 
Barrier is related to Edge. Edge is related to Sword. Sword is related to Warrior. Warrior is a synonym of Fighter. 
Counter <--Synonym--> Anticipate <--Synonym--> Look <--RelatedTo--> Investigation <--Causes-- Killing 
Barrier <--RelatedTo--> Edge <--RelatedTo--> Sword <--RelatedTo--> Warrior <--Synonym--> Fighter 