While playing frisbee with wife and son in our open yard where we can see miles in each directionWe all 3 heard sounds directly above our head!Alot tike a large bird swooping downIt Swoshed over our heads left us all wondering what made this sound , this feelingalmost like being a mouse in a field as a huge owl swoops down to get you !!We looked at each other what was that!!! then looked all over the sky for the object NOTHING After talking to wife and son ,we all felt and shared the same experience! all 3 of us felt as if it was a 30+ft. invisible bird swooshed 2 times with great force 10 feet above our heads then gone It lasted about 4 seconds