B737NG A/T Retard in ARM Mode
Imbracablecrunk,
The fcom is quite clear about it. Flare and touchdown capability is not available in single channel.
If flare is not armed it cannot engage.
Just recently, a crew in my company wanted to set up for an autoland but they pushed button's in the wrong order and they didn't properly check fma's. They didn't get a 'flare' armed indication and made a rough landing.
Best to try it in the sim sometime. Only takes a few minutes.