Disturbing is related to Noise. Noise is related to Headache. one thing you do when you Contemplate is Headache. 
Guard is a type of Defender. Guard is related to Duty. 
Disturbing <--RelatedTo--> Noise <--RelatedTo--> Headache <--HasSubevent-- Contemplate 
Defender <--IsA-- Guard <--RelatedTo--> Duty 