he did the same thing dring the performance I saw
I think it was at the Felt Forum in Madison Square Garden
I think the song was "Lay Your Hands On Me" ?

he turned his back to the people and fell backward
(talk about "TRUST"!)
He seemed to float on a sea of up-stretched hands as
the people supported him effortlessly and passed him
around while he went right on singing, until they set
him gently back on the edge of the stage. AWESOME! shocked