Not a person. A spambot. Software created by a person admittedly. But the bot will keep posting until a mod kills off the users.Usually by this time it has stopped. But some MORON is still posting right now! (SPAM)
On my other forum we have something called spam-o-matic which - in one click - bans the user and wipes all their posts and blocks the IP address from which they post and ... best bit ... logs the IP address with an online database which effectively blocks anyone posting on any other forum from that IP address too.
It's a fab tool for moderation