Bugged alchemist re-spec ?

[rdyxz]

Hey, i'm a transmutation speced alchemist and would like to unlearn this spec to pic another one (flask).

Following this: https://www.wowhead.com/npc=22427/zarevhi#comments
I just have to talk to Zarevhi and he should propose me to forgot it (and also to learn alchemist recipes).

Instead of this, i simply have a dialog and can't do anything... Am i forgetting something or is it bugged?

[acacar903903]

Try the NPC In lover city in Shattrath hes for elixir mastery but it might work.. u never know