Board Thread:Character Discussion/@comment-26235531-20150327013221/@comment-6175354-20150513003436

Edward Zachary Sunrose wrote:

But I don't think Hook and Will have any history together aside from what we saw in 4A. Colin O'Donoghue mentioned in an interview, that Hook and Will knew each other in the EF. He was not told the specifics, but knows it is what caused them to hate each other.