One day *Riley and Nero both look at each other in disgust as the two of them have had a heated rivalry throughout this competition.

Now that you have forced their hands together, then Riley and Nero look at each other with disgust and, during this unnatural gesture of forced friendship.

"She mine!"

They look at each other with anger. They don't feel like being good friends. They both see each other as enemies as this is what this forced friendship looks like and because they are rivalry.