I guess its open to opinion as to what happened, but my belief is that Sauron, with the Ring, would have been too strong to be defeated by anybody in single combat, or even if Gil-Galad and Elendil teamed up against him. That said, such a battle would definately have weakened him physically, hence Isildur makes the most of this opportunity and lands a blow to cut the Ring finger off and vanquishhim. As for Sauron just lying on the floor dead, I can't picture that at all, at least not when he still had the Ring.
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