The point is that descriptive writing is very rarely entirely accurate and during the reign of Olaf Quimby II as Patrician of Ankh-Morpork some legislation was passed in a determined attempt to “put a stop to this sort of thing and introduce some honest...
’I`d have you lot up in front of the University authorities first thing in the morning, if it wasn`t for the fact that you are the University authorities . . .`
Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.