More information is required. How tight are the short stack pushers? The first push looks relatively weak to me. Given he has SPR is ~3, pretty much any bet commits him. In his position with a flush or straight, I'm check raising, not calling.
The caller stands to have a better hand than the original pusher, but how good would it have to be? The nut four flush has ~36% equity, so he is light with his call, hoping to see other calls behind. Not a bad bet, given flushes and straights now have the odds
to call. I'd say that was the bottom of his range.
Hero has top 2 pair and looks to be good 70% of the time or more, losing badly to trips, flopped flushes & straights and is only 16% to improve. Call it 50/50.
This leaves the guy behind. If his stack is only big enough to call her loses another 10% equity, but gets paid for the loss.
Given unknown players Hero has to call, IMHO.
As the cards lay Hero has 47% equity (assume the 4th player folded) getting 3 to 1 on the call. Oddly if the QT was QQ, there almost no change in equity.