Security guard breaks leg tackling man on field at Giants vs. Cardinals game (Warning: graphic)

Warning: The above video is graphic.

A security guard suffered a broken leg after he wrestled a man on the field at AT&T Park during Friday's game between the Giants and Cardinals.

A video posted on YouTube captured the incident and shows the moment the security guard collapsed on top of his own leg, twisting it 90-degrees in the wrong way. Despite the probable pain, he somehow manages to lift himself up and maintain his attention on the intruder before backup arrives.

Both the runner and the security guard are ushered off the field as the crowd boos the over-zealous fan.