Yes, that was my interpretation of his actions as well. Yay, now I don't have to try to fumble my way through an entry of my own about it! *g*

He said early on in the series, in the one where he first met Zarek, that he wasn't on the side of the military or on the side of government, he was on the side of the law. And I think, like you, he saw Tigh's move as illegal, and therefore he acted.