If someone stops the "cast" bar on an npc, it just breaks the npc until the next maintenance.
Source: me. I clicked too soon and broke the casting, the npc no longer worked after that (on govinda)
A real sysadmin knows how to change the time.
If you make the same mistake while trying to make up for the previous one, you are doing something wrong.
As much as I'd love to say I offer consulting services, the scope of things broken is too large.