one thing you do when you Surprising is Shout. Surprising is related to Unexpected. 
you are likely to find Clerk in/at/on Airport. you are likely to find Clock in/at/on Airport. Clock is related to Shadow. 
Shout <--HasSubevent-- Surprising <--RelatedTo--> Unexpected 
Clerk --AtLocation--> Airport <--AtLocation-- Clock <--RelatedTo--> Shadow 