Brutal armor

Hi everyone,
i am leveling a warrior right now, I'm L39 and I'm kinda stuck in the chain I don't understand why.
I got the hauberk, got the gloves, I need the helm and legs.

According to wowead : https://www.wowhead.com/wotlk/npc=58...ngrim-firegaze
The other quests are available at L10 and L20.

Still don't understand why I can't continue the chain.
I opened a ticket but there are too many requests.

Try to navigate the quests here, you can see the quest chains, the quests they require, the race requirements, etc. https://aowow.trinitycore.info/?npc=5878#starts