Drop the 'obstruction' nonsense. He deliberately propelled himself into Suarez's legs. Are you on a wind up?
I've just watched it three times and I'm still not convinced it is stonewall. The defender stumbles and throws his arms forward and gets in Neymar's way, but Neymar makes no attempt to skip around the flailing arm to get to the ball. He just extravagantly falls over the defender's arm. It is one of those that if that's your defender and not given, you're thinking "we might have got away with one there" but without conceding we should have conceded. Lewis Dunk at home to MK Dons last season was far more of a pen than that one I think.