do really believe that there is so little design margin against these loads that the stab will detach?
I doubt this is as tender a structure as we are treating it here.
In the incident quoted by ozaub, the horizontal and vertical stabilisers needed to be replaced before further flight due to the significant damage caused by the asymmetric loads. The manufacturer found "the
ultimate load was exceeded by about 47 per cent, and the exceedance lasted about 0.125 second". It is indeed fortunate the exceedance only lasted 0.125 seconds, otherwise the stabiliser might well have detached from the aircraft.