The showrunners might have given a subtle hint in the episode that Jon Snow might be Azor Ahai. The prophecy reads, “When the red star bleeds and the darkness gathers, Azor Ahai shall be born again amidst smoke and salt to wake dragons out of stone.”
If you look at the scene in which Ned Stark entered the Tower of Joy, he kept Arthur Dayne’s sword, Dawn near the bed. It’s interesting to note that Dawn is forged from the heart of a fallen star and on the pummel of the sword, we can see the Sun, which is also a star and there was blood on the sword as Ned had used it to kill Arthur Dayne and we can see Lyanna covered in lot of blood. So this might be the red star that the prophecy talks about.
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