Saw this exact behavior this past weekend.I assumed it was some sort of bird mating dance but not sure. 
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					Originally Posted by Raven  speaking of Hummingbirds:i saw something the other day that surprised me
 a male hummingbird seemed to drive off a competitor female
 and forced it to right to the ground
 then it did this aerobatic maneuver flying in an arch
 back and forth keeping it pinned to the ground
 (think of a kid swinging on a swing over a ball directly beneath it)
 it did that about 8 times then sped off with the female not moving
 then slowly leaving the grass
 it came over to sip some nectar and left.
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 Saw this exact behavior this past weekend. I assumed it was some sort of dance / mating ritual but not sure..