Yes, it works just like sysnand. Not that it matters much though. Usually you can have emunand updated and when a new firmware is released (just like right now), it doesn't take long until GW releases a fix for emunand so that you can update afterwards.
While I know you mean in case of someone confusing schooling establishment from shooting establishment (many of the same letters) I am still going to read that as lockdown (also known as lock in) for a pub
being drunk in school was either because drunk on playing field or could not be arsed with one particular Thursday afternoon so went and had some beers and played some games instead before returning for an ill advised last lesson/period