Alright so this is super important to me because it's super interesting. What is known about "Slow Motion Thoron"? Was it even known at all?
I was testing frame stuff right now and got to Thoron's generation time. Pretty weird stuff; if you get interrupted on F20 (I used the spiking hit of Ness's DAir) you'll only cast an imperfect Thoron. It looks all thin and deals 2.5% damage. By F21 perfect (complete) Thoron seems to be cast. The thing is, I test these sorts of things by going into training and setting it to 1/4 speed when holding L, to ensure that I input both actions on the same frame. I normally have the character whose attack I'm using as a meter attack from behind the character being tested.
In this case, I had Ganondorf use his F21 FSmash on Robin from behind on the same frame I pressed B to cast Thoron. What looked like the normal beam appeared, but instead of it going offscreen and the tail of it dissipating (you know what I mean, right?), the beam simply disappeared, with the tail fully intact and still connected to Robin's hand when it disappeared. In addition to this, the tail actually began behind Robin, hitting Ganondorf. It hits Ness about a character space and a half behind Robin, and it can hit Kirby if he's not crouching or in his sneezing idle animation. So far I have only seen the back hit at 2/3, 1/4, and 1/4 (Hold L) speeds, in addition to Slow special Smash (despite it apparently being 1/2 normal speed? 1/2 speed in training doesn't trigger this), Slow special Smash with Robin under the effects of a Timer, Fast special Smash (same deal as Slow Smash and training speed, what's up with that?), and Fast special Smash with Robin under the effects of a Timer. Robin under the effects of a Timer under normal Smash speed doesn't trigger it, despite the same graphical glitch of a persistent beam occurring.
So yeah, what's the deal with all of this? Does anybody know?
Also another tidbit I found out right now that may or may not already be known as well is that the duration of Thoron's beam seems to actually be constant. That is, it will last only a set amount of time, rather than sticking around longer when time is slowed down or passing by quicker when time is sped up. This means that Thoron will actually hit more often when time is faster than normal, as long as you don't channel it. The beam is out the same amount of time as it would be at x1 speed, but the hitbox regeneration is still operating under the x1.5 speed environment, so you get more hitboxes for the same duration. Likewise, Thoron hits fewer times when at lower speeds, since the hitboxes don't get to regenerate as often for the duration of the beam.
Like, at x1 speed, unchanneled Thoron hits 4 times for 2.5% damage, totaling 10%. At x1.5 speed, it literally hits 1.5 times more often; 6 times for 15%. At 2/3 speed, it hits 3 times for 7.5%, and at 1/4 speed it hits. There are issues with this though; at 1/2 speed, instead of only hitting twice like I would have expected, it hits 6 times, like it does at 1.5 speed. At 1/4, it hits twice.
Yeah Thoron's pretty interesting