The dude
jumped to save time and then fell a
mile from a floating city to the hard ground below. Logically, he should have died, but the rules lawyer claimed that falling damage totalled out at 20d6, which he could survive, even though no one should be able to survive a fall from that height without magical intervention or something. Common sense would have dictated that a fall from such heights would be insta-salsa, remaining HP or not. I wouldn't feel comfortable bending the laws of reality just because of a dice mechanic, especially if the player was abusing said mechanic for his own gain.
But, that's just my opinion.