During an altercation, all players not participating in the game must
remain in the immediate vicinity of their bench. Violators will be
suspended, without pay, for a minimum of one game and fined up to
$35,000. The suspensions will commence prior to the start of their
next game. A team must have a minimum of eight players dressed and
ready to play in every game. If five or more players leave the bench,
the players will serve their suspensions alphabetically, according to
the first letters of their last name. If seven bench players are
suspended (assuming no participants are included), four of them would
be suspended for the first game following the altercation. The
remaining three would be suspended for the second game following the altercation.

http://www.nba.com/analysis/rules_12.html?nav=ArticleList

Paul was definitely in the "immediate vicinity of the bench"