Good call pre. On the turn, it depends on what reads you have on him. You should most likely be able to pick up some kind of timing tell, and if the big red warning signal go off, then fold.
Alot of players in freerolls are going to shove a made hand to make it look like a flush draw, and they don't know how there going to play the hand so they choose the most obvious.
I also like folding pre you are oop and unless you flop a flush you are not gonna be in a good spot. Also why are we shoving the turn here. about a half-3/4 pot size bet would have been better then when the straight raises and the button callls, you can be pretty sure you are beat and can fold.
Not sure why the Button didnt shove the flop there which would have made it an easy fold on the flop for you.