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..