you know, I actually just had a weird thought about
EDIT: Quote is being bad, just go watch the gif from the OP if you need to while reading.
What that thought is? An excerpt from the FF wiki
Finishing Touch is Cloud's second-to-last Limit Break, learned after using
Meteorain six times. It inflicts
instant death to all enemies, and for enemies immune to instant death, it will inflict damage equal to 3.125 times normal damage.
Note the bold underline. Now Cloud is based heavily on his source game, so how does Finishing Touch work there?
The enemy is hit and....blown straight up off the screen. Now back to our gfycat, Cloud hits both Roy and Link, and before any steam or red glowing can be seen, they get hit with the red spark effect and just die. It's especially the hit on Roy that's special though.
As you can see in the above gif, Roy is not only just hit, but kept in place for a few frames, while the camera zooms in, a sound effect is heard, and most telling, Link is using his Dash Attack almost in slow motion. Coincidentally once the sound effect ends, Roy is sent flying into the air and Link stops moving in slow motion. Then with almost no time in between, the back end of the attack hits Link (with a hit sound of it's own though no where near exaggerated) and Link flies off and gets KO'd himself, though with no real wait time as he just flies off as soon as he's hit.
Now what move is similar to this?
True, the KO Punch isn't a true OHKO, but all the similarities are there. While we need to know more facts about Finishing Touch of course if it's anything like it's source material the it'll be far far more crippling than we may have imagined .