Even tho Kayn and Rhaast don't like each other, they do sometime enjoy each other company....
I love the way they talk to each other most times its just insults back and forth. But occasionally you hear them learning about each other, almost like they could have been friends.
For example, sometime when Kayn cast W and slams the scythe down, Rhaast gets excited and shouts "More". There's another time when Kayn goes through the wall, he says something like "You ready" and then Kayn responds "I don't like this".
Sometimes Rhaast tells Kayn to let lose his grip.
It's like they are slowly bounding but in the end, one has to consume the other....how sad.