Not the video game, but a couple of hyper-active, territorial male American Redstarts.
As I walked down a narrow lane at the Prairie Woods Environmental Learning Center near Spicer, MN, I could see a different American Redstart male flitting about and singing quite insistently about every 100-200 feet. It was quite an amazing density of just one warbler species in this narrow tract of forest that bordered a large cattail swamp.
Something triggered a chase that involved 3-4 males darting back and forth through the conifers on the opposite side of the road, and then finally two of them really went at it, clutching at each other and falling to the ground to continue the battle.
Perhaps one of these males was trying to invade the other’s space. When singing doesn’t warn them off, the antagonistic behavior escalates to chasing. If that doesn’t drive the interloper away, then a demonstration of physical superiority is necessary, which is probably what happened here.
Male birds usually don’t resort to physical contests; it’s energetically wasteful and physically dangerous. Intensity of color, vigor of their sound production, and energy of their territory defense are usually the only signals necessary to ward off potential competitors.