system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar - Legend of Aang, Legend of Korra] Is the Avatar able to master all sub-bending?

We know that Avatar is capable of mastering magma, metal and redirecting lightning, but can he use any sub-bending he wants? My biggest question is about Combustion, Blood and that strange astral thing that Jinora has.
gpt
Yes, the Avatar can learn all forms of sub-bending as those are just different expressions of the same power.

I think that Jinora's astral projection has more to do with her connection to the spirit world than her bending; like how Iroh was able to see spirits in the astral plane.