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I've been thinking about the mechanics of Bran's powers and what happened to hodor.
He warged into hodor in the present, and then he warged into him in the past at the same time.
This linked past hodor with future hodor, and basically he died and his mind was stuck in the same hodor state ever since.
The reason that Bran had to do this to him was that hodor's mom or whatever said in the prior flashback "He'll never learn how to fight!!"
Bran had to stunt Hodor and make him simple.
This let him take over Hodor in the earlier seasons and use his own knowledge of fighting inside of Hodors body.
It let him survive and get to where he is today. Hodor was a loyal servant and would liked to have helped, but he had no skill.
When Bran was visiting the Night's King he used the godswood's roots to do it. When the raven died he said "Leave Me" and Bran was still inside of a vision even though he wasn't touching the roots. The raven also said that Bran would "become him" so does this all mean that Bran has his vision powers at any place now and he does't need to be by the roots of a godswood to travel into the past?
Does it mean that Bran can warg into anyone now? Can he warg into people in the past?
Have we seen the last of the ramifications of the mark on Bran's arm, or will it spell doom when Bran goes through the ice tunnel to castle black?