The councillors should decide motions and amendments, by majority decision, not the TC. They are also responsible for deciding whether or not to accept or decline advice. So, if I have interpreted what happened correctly; a motion was proposed, an amendment was raised, the TC suggested gaining legal advice which was not accepted and then the majority carried the amendment.
I accept the point of the possibility of the negation of the original proposal, but trying to use a vague point of order without majority support will get you nowhere. Incidentally what was so contentious that a legal opinion was thought necessary?