I managed to kill Baal on Nightmare difficulty. He kept teleporting to the upper right corner in the middle of the room, right at the end of the narrow bridge leading to the World Stone. When Baal died, Tyrael flew in and congratulated me, but did not spawn the portal. Now I have to do it all over again.
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I can confirm this. Baal not wanting to move from his corner, and no portal now…
EDIT: Actually it doesn’t matter that much, it still count for the progression, nightmare unlocked. Though, for player doing it the first time, it means no ending cinematic !
Thank you for confirming that it does not affect progression. The same thing just happened to me. If Tyrael is facing an edge, he will not spawn the portal. Oh well!