Isildur was closer to the exit, in reverse of Sam and Frodo. Therefore, Elrond would have had to chase him, and Isildur would have had plenty of time to get away.
Exit <---------------> Isildur <-----------------------> Elrond
Kinda pointless attempting to force him. More like, shoot him then toss him in. That could have worked.
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"In a hole in the ground there lived a hobbit..."
"'Well, I'm back.' said Sam."
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