Yes. It doesn't say that you have to make a roll to make a decision. If you fail the roll, you fail at your action.
It is making the decision to attempt murder that required Aedhros to make the Steel test.
I don't understand why you think you can school me in the play of Burning Wheel. As far as I know you've never even played it, or read the rules!
It's like
@Faolyn, who has never read the rules, thinking that there's some ambiguity in the fact that attempting cold-blooded murder can trigger a Steel test.