I thought it was a clear penalty at the time and I still think it was having seen the replays.
Storey clattered into the back of Alessandra's right leg and, thereby, caused him to fall over. I think it is irrelevant whether Alessandra placed his leg in front of Storey (deliberately to draw the foul or otherwise). Alessandra was in front of Storey and entitled to move his body in any direction he chose. Storey was too close and couldn't avoid tripping Alessandra up. That is simply bad defending however you look at it and he obviously brought Alessandra down in the penalty area. Ergo it was a penalty.
Storey clattered into the back of Alessandra's right leg and, thereby, caused him to fall over. I think it is irrelevant whether Alessandra placed his leg in front of Storey (deliberately to draw the foul or otherwise). Alessandra was in front of Storey and entitled to move his body in any direction he chose. Storey was too close and couldn't avoid tripping Alessandra up. That is simply bad defending however you look at it and he obviously brought Alessandra down in the penalty area. Ergo it was a penalty.