When the RTL goes, it freezes (hard) at the moment of failure. The range is 31.6º ≤150 CAS to 4º ≥ 350 CAS. Figure the speed when the failure occurred and imagine having enough authority to damage the tail from there. As previously stated, you do get it back at slat extension.
Is there theoretically the possibility, that the RTL got a wrong - much lower - CAS/TAS before it froze?
How does the system work, when data degrades gradually, not instantaneously? Is it possible the RTL got the wrong CAS before it got no CAS at all and froze?