If the field has a dead ball line, the spectators must be outside it. If not, define one before the game or as soon as its absence is noticed. This must be controlled during play, so that at the time of each pitch, no spectators are over the line.
If a spectator is inside the line or reaching inside the line and the umpire judges the interference caused the fielder to go into DBT; the umpire can award the offended team what is appropriate. If the fielder could have put out another runner after the catch without the interference; the out can be awarded. If not, spectator interference is an immediate dead ball and no runners can advance. Again, that is if the umpire judges the intereference caused the fielder to go into DBT.
In this case, the umpire ruled no INT, so no effect other than for the ball becoming dead.
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Officiating takes more than OJT.
It's not our jobs to invent rulings to fit our personal idea of what should and should not be.
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