I didn't expect my idea to be correct, just thought I'd toss out
an explanation to explain why it was the way it was. On the mud
I used to play disguise was a skill but was also a toggle... i.e.
once you succeeded you were disguised until you deactivated it and
what it done was... for example if you were human, instead of saying
a human enters a human leaves it might say... an elf enters an elf
leaves etc... and another side benefit of it was it disguised your
alignment so you could pass normally aggro mobs...
my input was just a bit of fun...
sorry for the distraction