So, we are talking about pitch attitude control without reference to
the visible horizon. *In that situation how do we control roll and
yaw?

The same way as we control roll and yaw in normal flight, since we
don't need a horizon to do this. Roll can be detected as long as there
is a reference in the distance we can see we are rolling with respect
to, and yaw can be detected using a yaw string or slip ball. Balanced
bank will always produce a turn, which can of course be seen as the
reference surface moving past the nose.- Hide quoted text -


A reference in the distance we can see we are rolling with respect to
is, in my expeience, a horizon. It may not be THE horizon but is
sufficient to control the aircraft both in pitch and roll. I think
Bill is trying to make the point that an AOA indicator would be useful
when there is NO horizon.