"180 seconds can be a universe leading to new discoveries. The epic "Rumble in the jungle" that took place between Muhammad Ali and George Foreman in october 1974 led to a reversal of fortune.
The dashed line indicate the exact moments at which Ali makes contact, versus to solid lines of his opponent."

http://www.imagenow.ie/gallery/flash.htm

found via http://tinyurl.com/5odsdj