Chris Reed wrote:
(a) the pitch over to a proper recovery
angle is much higher than a pilot trained on aerotow
only would expect,
(b) there is a further trap in these circumstances
in that G is reduced
during the pitch over, so that any attempt to turn
before full G returns
can lead to a stall and spin (stall speed reduces with
lower G)

Also a reminder that a rapid pitchover from a high
angle/energy cable break can result in a 'Vomit Comet'
reduced/negative G sensation which has over the years
convinced some pilots that the glider is stalled.
They then keep pushing until the glider reaches the
near vertical or the ground whichever comes first.

This difference between stalling and stick induced
negative G may not have been sufficiently well demonstrated
to pilots trained on aerotow.