Disturbing is related to Noise. Noise is related to Headache. one thing you do when you Contemplate is Headache. 
Seize is a type of Overwhelm. Grip is a type of Seize. 
Disturbing <--RelatedTo--> Noise <--RelatedTo--> Headache <--HasSubevent-- Contemplate 
Overwhelm <--IsA-- Seize <--IsA-- Grip 