I had the same reaction when I first read this review. As the episode was unfolding, I couldn't believe what was happening. Once Hunter gave up Wally, all Barry had to do was fight him head on, since he managed to defeat him a few hours before, but instead he decides to give all his powers to the super-powered serial…

The Doctor is definitely the Magician; Shona called him a magician in Last Christmas and he was also called that in the prequel, the Doctor's Medication by that medieval guy with the axe.