The Serpent's Heart (ELYON X ISSA)

Elyon is a fairly unknown character from the last DoSaB book. Issa is one of the most known characters there are. They have "moments" in the book, but it ends before we know what happens. So what does happen? What if they were brought together to root out a group of rebels set on killing all Angel and Chimaera who would dare being together? What if they became one of the targets?