Looks like Ren is having a hard time trying to control the Kuon inside him..
And I wonder what happened between Ren and Sho.. I really wonder why Ren is angry at Kyouko, because I dont think he has any particular reason to (he is not her boyfriend or anything, so I dont see how he has the 'authority' to be angry at her for being with Sho? Maybe it is jealousy?) Unless Sho said something unnecessary to Ren..
I wonder how Ren and Kyouko will act next.. I bet they will just continue acting as the Heel siblings. But I sure hope that they both will talk this out!