Catch is a type of Witness. Witness is related to Trial. Defense is part of Trial. Defense is related to Attack. 
you are likely to find Tree in/at/on Town. Town can be used for Convenience. 
Catch --IsA--> Witness <--RelatedTo--> Trial <--PartOf-- Defense <--RelatedTo--> Attack 
Tree --AtLocation--> Town --UsedFor--> Convenience 