It is extraordinarily unlikely that - had you stayed - you would have won that jackpot, unless you happened to press the spin button at the precise moment the other player had. even taking the time to light a cigarette or order a drink interrupted whatever results the RNG was giving! The gamblers are sitting there in front of slot machines, longing desperation to win something. the result of the previous spins and the time it took the credit meter to count up the wins interrupted whatever results the RNG was giving. playing at the casinos are never smiling. the time it took to select the number of lines played (and whatever other options the machine offered the player) interrupted whatever results the RNG was giving). the very fact that you left the machine and it was not being played - even for a few moments - interrupted whatever results the RNG was giving. It's all determined by the (pseudo) random number generator at the EXACT moment you press the button. every spin must be able to deliver any of the available winning combinations (some are much more likely than others, of course).
While it hurts psychologically to see someone hit big on a machine you've just left, take solace in the fact that, by law, all spins are equal. Oh well it was one of those nights I was kicking myself.<< >So shortly after that I came back only to see she won over $3,000.00!.