No, but I really was surprised by that! Cass actually behaved himself! I was expecting him to explode - especially when Tamlin was getting all personal about Feyre in bed - but no. He was so chill, and I was so proud!
Page 101 and 169 of ACOTAR. Feyre is in Prythian and the shadow she sees in her dreams HAS to be Rhys! He did not break into her mind and make her fire the arrow, she dreamed about firing it and since she was over the wall, she could sense him.