I have, in the past had this "freeze" effect happen to me. My Dom at the time saw it immediatly when it happened, and stopped all scening, also taking note of what had been done and how long, hard etc. And yes, it is VERY akin to what I felt at subspace EXCEPT... in subspace there is a complete feeling of saftey and bliss... during a "freeze", it is complete terror, except the outward reactions are VERY similar. (or so I have been told) I was told that when I hit subspace my body either goes completely limp... stands against the cross and sways gently or stands peacefully. When I am "frozen" I turn stiff as a board and have no response.

Hope this helps a bit

Ds