Paul Stephenson swung in a pacy ball from the right , Tommy Miller missed the header .
Henderson thundered the ball in on the volley for his 19th ball of the season , giving Blackpool goalkeeper Phil Barnes no chance .
Paul Stephenson swung in a pacy ball from the right , Tommy Miller missed the header but Henderson thundered the ball in on the volley for his 19th ball of the season , giving Blackpool goalkeeper Phil Barnes no chance .