Rules Regarding Withdrawals

I have not been able to find the exact paragraph on this in the rulebook
(presuming there is one), and the USFA has not yet replied to my query
(admittedly, I emailed them just yesterday), but since we have a meeting Friday
night, I am wondering if anyone can cite for me a rule dealing with the
following situation:

1) Fourteen fencers appear up for a scheduled open event.
2) The manager decides he wants to get 15, to raise the rating to a C-1, so
phone calls are made to various fencers around town.
3) A 15th fencer does show up, after the scheduled closing time. It is made
clear to him -- and apparently everybody else, too -- that his sole purpose is
to raise the rated level of the event. He is requested to register, fence just
one bout, and withdraw.
4) This is exactly what he does. There is no pretense of illness, injury, or
any other valid reason for withdrawal. Needless to say, his withdrawal has a
negative affect upon the indicators of the four remaining fencers in his pool,
but that is a minor quibble.

Where in the rulebook does it say this cannot be done? We would like to
discourage both our managers from doing such a thing in the future. Quite
frankly, I was stunned to be told this had happened. The least he could have
done was fallen down on the floor and insisted his ankle was twisted. I won't
even address the behavior of the manager.

Thanks,
B.C. Milligan