Bills CB Dane Jackson leaves 'Monday Night Football' in ambulance

Monday Night Football's matchup between the Buffalo Bills and Tennessee Titans came to a standstill when cornerback Dane Jackson had a violent head-on collision with a teammate.

The video of the play is graphic, so watch it at your own discretion. 

What appeared to happen was a routine football play we see every weekend, which made this scene all the more jarring. Jackson was tackling a receiver after the catch and as he brought him down to the ground, his teammate lunged in to help him out.

Because of the angles of the tackle and the fact that the receiver was being taken to the ground, Jackson's teammate accidentally speared him directly, causing the cornerback's head and neck to be driven completely backward.