I wasn't there, so I do not know if the seizure was real. I believe he really did have a seizure because it actually looks like he's cutting down on the alcohol and barring a jarring experience close to death, like a seizure, I don't think anything would have made him consciously cut down drinking as much as it looks like he has.
When I was with Tarl, he was drinking so much that he was an uncontrollable monster. He would have tantrums and throw things frequently and not even listen to me speak. There were moments when he was fun to be around, but with the drinking at that obscene amount, he was completely uncontrollable. I could not imagine him being that uncontrollable, hateful and disrespectful towards Mel. He usually obeys her. I believe his mom, that Mel is seriously controlling his alcoholic intake and he's letting this happen because the seizure scared him.