The Aston Villa forward kept his cool to round Mannone and slot into the empty net .
Lee Cattermole was at fault , making a huge mistake that Gabby Agbonlahor seized upon .
The Aston Villa forward kept Lee Cattermole 's cool to round Mannone and slot into the empty net .
Lee Cattermole was at fault , making a huge mistake that Gabby Agbonlahor seized upon .