When the u t xo flipped over into emergency mod you would just need to sign a bit coin transaction with two out of those three block trem keys. So in practice, this means that someone would have to go wherever those keys are physically custodied and compromise the security around them. We don't know who has those keys, how they were created, where they're held, or what security procedures are around them. But we do know that the main threat vector here, again, is employees. The threat vector is the people who created those keys in the first place....