Wrathion releases his thumb from his mouth, inspecting it to see if blood is still welling up.

"It was," he admits, tongue running over his teeth as if to get rid of any excess. "I have forged a temporary connection between us to demonstrate the concept. The link will allow me to communicate with you, and I believe it should allow you to contact me in turn."

The concept of an alternative, emergency means of communication that is. Anduin had, after all, agreed that he would find such a thing comforting. Obviously smearing blood on him repeatedly would be less than ideal, but this is just a test -- if it is approved then they can move on to the next phase of things.