Rescue is related to Operation. Operation is a type of Surgery. Surgery can be Risky. Risky is related to Dare. 
Assume is a synonym of Absorb. Involve is a type of Absorb. Involve is a synonym of Overwhelm. Overwhelming is derived from Overwhelm. 
Rescue <--RelatedTo--> Operation --IsA--> Surgery --HasProperty--> Risky <--RelatedTo--> Dare 
Assume <--Synonym--> Absorb <--IsA-- Involve <--Synonym--> Overwhelm <--DerivedFrom-- Overwhelming 