Legal Termination of a Warlock

The tech startup really needs to fire somebody before the sexual harassment suits start dropping, so why not that employee they're sure is a warlock? After all, nobody wants an older employee at a tech company, but how do you document cause for termination on a warlock? Surely The Big Book of $tartup $uccess, the latest management fad, has a chapter for what to do when magical skulduggery is underfoot... or is that why they brought in a specialist?