Baraion was angry that Drelduin took Talindra without telling him anything. He wanted to know if she was alright. At least he could have informed her about her condition. When he called him up, he gave a generic reply that one must always talk to Edhelriel. Well, now he knew where she would be, where Drelduin was taking her.
He left all the girls he came with and walked out of the party. He had to get away from everyone. He just attacked his own brother just because he knew about him and Talindra. He knew Othorion didn't deserve that, but he could not help himself. The moment he mentioned her name, all his memories came back flooding and he just attacked his brother.
He ran outside in the cold air and stood in a corner, trying to calm himself down. He had to get that girl out of his mind, but Talindra was going nowhere. Why did she occupy his brain to such an extent? He wanted to make her jealous but ended up getting worried for her.