How many bases ?

[rbmartin]

7.04 Each runner, other than the batter, may without liability to be put out, advance one base when-
(c) A fielder, after catching a fly ball, falls into a bench or stand, or falls across ropes into a crowd when spectators are on the field; A fielder or catcher may reach or step into, or go into the dugout with one or both feet to make a catch, and if he holds the ball, the catch shall be allowed. Ball is in play. If the fielder or catcher, after having made a legal catch, should fall into a stand or among spectators or into the dugout after making a legal catch, or fall while in the dugout after making a legal catch, the ball is dead and runners advance one base without liability to be put out.

'nuff said