I doubt this will have tons of applicable uses in 1 v 1s but I found out that if you use Shiek's up B on the ground hitting an opponent they go at a predictable angle (around 45 degrees it seems) and you can teleport directly there and hit them back down to the ground at mid to high percentages depending on the character. It seems like a good player would be able to tech this and hit you but maybe mind games or something. I did it to one of my friends and was able to downsmash them before they realized what was going on but he wasn't exactly a good player. In any case mostly just a fun fact.