Slash targeting is weird... And, uh... Teleports you?
1First hit lands like normal, second hit misses and slashes the air, third hit... TELEPORTS DIRECTLY TO THE TARGET?! WHAT?!
If we look at the order of events in slow motion Talonflame uses brave bird which has immense startup, I hit the slash button, Talonflame charges forward, I lunge forward a split second after, slash goes into multihit mode teleporting me to Talonflame's location.
If I were to take a guess as to what happened, I'd say slash registered as me connecting with Talonflame after it had already moved. This resulted in the second phase of slash starting which is coded to teleport Zeraora to a precise position next to the opponent. The reason for this teleport is likely making the multihit connect more consistently.
I'd say this glitch is nearly impossible to recreate. The timing of the moves being used combined with their properties likely caused a very rare outcome.
Though this game is very glitchy tbh, I've never had a switch game crash more often. Sometimes models have their textures and body parts completely mangled. One time I hit someone and they started T posing, basically the game is not very stable. But when it works it is fun.