one thing you do when you Surprising is Yell. one thing you do when you Fight is Yell. Fight is related to Competition. Arena can be used for Competition. 
Professor is related to Character. Character is a type of Recommendation. 
Surprising --HasSubevent--> Yell <--HasSubevent-- Fight <--RelatedTo--> Competition <--UsedFor-- Arena 
Professor <--RelatedTo--> Character --IsA--> Recommendation 