Granted on a much much smaller stage, but I have folded quads before in a much similar situation. So yes, I know I could. I can honestly say that when I lay a big or even huge hand down I am convinced I know what the other player has and just move on.
if your scared to play why be entered into the tournament :shrug: fuck folding quads, make him show his hand :0074 obviously the guy that had the potential straight flush was a better poker player