It’s not just blood, it’s also place and time. Jaime has his dream while sleeping on a weirwood stump, for example.
And Tyrion is one of the three heads of the dragon, and thus magical.
Also, to be super-duper blunt about it: magic gonna magic.
This isn’t to say it doesn’t follow certain rules; it’s not just random. But the higher mysteries in the context of ASOIAF are very clearly, to a certain extent, numinous and unknowable and do not entirely obey hard and fast laws.
Prophetic dreams can come to people for no better reason than that the ineffable forces of the universe, sometimes, touch them. That’s it. There doesn’t need to be some kind of scientific cause and effect.
Yeah, if people want a metaphor, imagine the ripples and displaced from dropping a boulder into a placid like. That’s whats happening with magic here. People with no connection to magic are also being affected and having magical dreams and visions.
Indeed, but if I could build onto this metaphor…
A while back, I was on the Boiled Leather Audio Hour talking about prophecy and what it has to say about free will vs. predestination, and I put forward the theory that these “ripples” are essentially being caused by the trauma of the Red Wedding, rippling backwards in time to those who are sensitive to them for various reasons.
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