[Kwantum]

2nd barrel is fine here. The board changed significantly on the turn, it's a good double barrel.

However, I think since he called the turn he's probably going to stay stubborn with his Qx and his two pair hands on this river card. Obv you fold out some naked and maybe even QsXs hands on the river, but I think it's unlikely give his turn call of your PSB. He can easily show up with AsXs here, and he's not going away for a 3rd barrel if he does have that.

I think you're only really folding out something like 86s, 64s, or a dry flush or straight draw that missed. Given you hold some spades though, I think his hand is much more likely to be a one or two pair hand that he's not folding.