One of the topics that I receive far too many questions on is if runs are to be scored or not scored. Understanding of the requirements for scoring / not scoring runs is imperative to umpires at all levels of play. There are a few basic conditions for scoring or not scoring runs that are detailed below.
As long as the fielder is not touching the ground in dead ball
territory when he catches the ball, it is a legal catch if he holds onto the ball
and meets the definition of a catch. If the catch is not the third out and the
fielder falls down in dead ball territory, all runners are awarded one base. If
the fielder remains on his feet in dead ball territory after the catch, the
ball is alive and he may make a play.