I thought I hear him say that too, I couldn’t remember. But there’s technically a limit, in the DMG and the PHB, that caps the amount of damage at 20d6 (or I guess 6d20 if DM’s being lazy). So, technically, regardless of distance, the most damage a player should/could sustain from a fall is 120hp. That said, if it’s 1d6 per 10 feet (which is also a rule) I think that’s a silly rule. Especially with higher level characters, who regularly put themselves in positions where they’re more than 200ft above the ground with the potential to fall. If you put yourself in that scenario (falling 1,000 ft) you shouldn’t get to only suffer damage of a fall 1/5th as high. That said, I’m still happy Keyleth tried it, because it would’ve been great if she had succeeded and/or just went bird instead of goldfish at the last second, and also very happy that Vex was right there with a revivify coin.Â
Basically, tl;dr Matt Handled that situation fine, Keyleth did a silly thing, but it was awesome, and people should stop being such “your fun is wrong”ers. If you don’t like the game they play, go start your own.Â