Did you people know that, in the novel Tides of War, shortly after Theramore’s Fall, Jaina approached the Council of Six for help against the Horde, and asked them what they’d do in a theoretical situation where the Horde burned Teldrassil?
Well, fast-forward to BfA pre-patch, and what do you get?
In fact that’s probably why Jaina made this expression when she heard Anduin say that Sylvanas burned Teldrassil:
She’s basically connecting all the dots in her mind, and realizing that that hypothetical scenario she presented to the Council years ago, actually came true…
If only the Alliance, Kirin Tor, and Horde revolutionaries had listened to Jaina, then so much could have been avoided! Teldrassil could have been saved and the Jailer’s plan could have been thwarted before it was even set in motion.
Jaina really is intelligent, she alone could predict that this tragedy would occur, while the rest of the world was shocked. Jaina knew from the beginning, yet did anyone actually listen to her? Nope. I bet they’re all regretting it now.