[curtains]

Probably J9 is too strong, makes more sense with weaker hands like T3o etc. Basically you lose nothing by not pushing preflop, and can gain a little bit postflop if you make perfect folds against his range. Of course in the heat of the moment it's hard to do so, but theoretically it's certainly correct to not push with some of the weaker hands, and to even fold postflop in some rare situations.

That being said, you won't lose much if you never fold this type of spot.