No, good point. He'll need to leave under his own power as soon as it expires. If not he'll then be detained and deported when caught on overstay for the reason of visa expiration. Fehr will be on immediate overstay when eligible for release, so he'll be escorted to the airport unless he has no ticket. Technically he'll be deported for that reason then, not for other crimes, and that's the norm.
Immigration may also apply its own subjective judgment whether to grant, revoke, or extend (cf agents getting extensions on IO authority) a visa or not. There's no trial or judicial appeal. You aren't even owed a reason, though they usually give one.
We have a hard time processing that reality, but it's good to know and keep in mind.