Hi all,
I couldn't find an answer to my question on the forums, so let's try this way.

Yesterday, we've completed Death Knight Bane spell, in co-op. (Spell + Vial of Blood) We decided to go back into the mines to kill the DKs. However, we can't enter via original entrance and if we use the portal to go back - whole mine is flooded by lava.
Did we miss something? Or the mine should be flooded but DK's appear later in the game?
Thanks!