Elrond, why?

But Elrond was more honorable than that. Like I said, if he didn't die or kill Isildur then, he knew that if Isildur would rise to power, he would have to face him then. Elrond had more than enough legitimate reasons to fight with Isildur, and they were surrounded by lava. He had numerous chances to throw Isildur into the fire, why didn't he?

Elves are infinately more powerful than men. He could have taken him.