Likewise, we can't tell whether or not Vita is the only Wolkenritter to know "Magical Prison" (Gefangis de Magi?).
Vita only trapped and attacked Nanoha because she didn't know about her connection to the Bureau. After that, the Wolkenritter attempted to avoid the TSAB mages rather than hunt them for linker cores, so they had no reason to use the spell.
At least not until Nanoha and Fate caught them in Hayate's hospital room. Shamal only used a jamming field then, but perhaps the TSAB would have detected another Magical Prison.
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