This is totally happening to me. I usually get at least 2 gifs from here to show to friends, and we get a good laugh from them.
Sometimes I'll knock someone away with Dsmash or Nayru's, then feint a jump towards them while they're still on the ground. Then I'll drift back and release a mid charge Phantom to catch their getup. I also use it for basic landing traps, if they burn their jump.
Din's...nothing. I've pretty much cut that move out of my general playstyle unless I'm playing really defensively (read:statue Zelda). The only use I've found for it is using it after a dsmash near the ledge. They're too low to airdodge so they have to get hit by it. Works best near KO percent, so they get knocked lower and farther. I actually get a surprising amount of KOs like this.
But...instead of using Din's, you could just Dair or FF Nair them instead...but dying to Din's is much more embarrassing. Oh, and make sure to taunt if you land it.
Tfw you're reading 20 pages of the social, and you see more being created as you read.
