I may have missed something
No you didn't, I did. In the case of the Comet the nose was lifted off at 80 knots, long before the unstick. The first two Comet crashes were caused by the procedure, one getting airborne in a stalled state, the other ran off the end on take off because the induced drag imposed didn't permit acceleration within the runway confines. Too high an attitude of course, but the difficulty was in judging same. Just interested in the "why" of the procedure.
Thanks for the Vampire shimmy explanation.