Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
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The decision came six weeks after the FBI executed the search warrant at the Virginia home of reporter Hannah Natanson. Porter declined the Post and Natanson's request to return the devices immediately but decided on a court-led process to ensure that the search is limited to materials that may aid a criminal case against an alleged leaker who was in contact with Natanson. He also rescinded the portion of the search warrant that authorized the government to open, access, review, or otherwise examine the seized data.
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(There are other emergencies that could bring us to this point. One is a fire, which could result from machinery shorting. Another is a toxic ammonia leak. But these are even more unlikely.)
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