the way it would need to happen in normal circumstances is for the scBTC to be mined back to BTC, by reversing the proof, most likely via merge mining. since the most common cause of a failure is likely to come from a 51% of the SC since it is inherently less secure (<100% MM'd) by definition being able to get mined back is not going to happen. after all, that would be the purpose for the attack; to kill off everyone's scBTC while simultaneously shorting scBTC on an exchange while going long BTC on the MC.
that would be a fun attack.
Then it won't happen with my consensus design for PoW because my design can't be 51% attacked. All such attacks are filtered out by a clever aspect of the design and this proof of filtering could in theory be incorporated into an SPV.
Checkmate dorc.