Razorscale: Dodge and cast?

According to MMO-Champion, Razorscale has two phases. He's in the air during phase 1, and on the ground during phase 2. Those phases repeat until he is brought down. Just looking at what MMO-Champion has to say, the best preparation is running what I already do and learning to run around and dps (or heal, I still am making myself available) at the same time.