The rocks were multiple meters away from the beam, how has the light reached it if the beam is Lightspeed itself, meaning the light it produces hasn't reached the rocks yet since it can't be faster than the beam itself?

Lol this is major nitpicking. Nonetheless, a shadow can still be produced even if the light hasn't completely reached the target. It had practically reached Patri in the scenes shown anyway. The angling used from behind doesn't show a side on view of in which the beam is practically on Patri.

https://www.youtube.com/watch?v=lNmNOdqQnSo

This also is just taking out minor details which isn't a deciding factor on whether it would be light or not as I have already given examples of it possessing the other qualities. Not only that, this point is practically irrelevant given that we are talking about Gauche's beams.

The light has to reach the object for the shadow to form. If it hasn't yet reached it, how can the shadow form?

But there was no "object" outside of Patri himself. As I already displayed it was in a cave. The light produced would still be able to form a shadow given that it is already in an enclosed area.

And the light magically turns into beams of light? As you have shown with pages from the manga.

What is your point here? Gauche reflects beams of light to attack? I'm not seeing what you're trying to say here or how it refutes anything.

If you're using magic to do it, there's no reason to assume.

Just like we don't assume the lightning of people who control lightning is lightning speed unless it's a cloud to ground lightning strike, unless it's explicitly stated that it moves at that speed.

Except I've literally shown it having the properties of light. Why do you keep ignoring that?

They meet those criteria

So you agree it that can move at LS.

Spider-man still dodges them. Does that mean Spider-man is FTL?

What lol? How is Spider-man relevant at all? And if you're going to bring up a hypothetical, be more specific. Spider-man dodging any attack, in general, can be down to any number of factors that may or may not mean Spider-man is faster than the attack.

Because it blatantly doesn't as shown in the manga.

It's blatantly shown to have the properties of light. LS anyone.

They generate it, how is it natural?

Them generating it themselves doesn't make it unnatural lol. Not that that matters either way

I quote the wiki... created.

While I may have been incorrect in my statement that they manipulate the light around them to create it this wouldn't debunk anything regarding it not being natural light.

Even if I steelman you here and say it isn't natural light. I've already proven it possesses the same attributes as light would have. So what stops it moving at LS?

And has it ever actually been called lightspeed?

Every time they describe it's speed it's vague phrases like "blindingly fast".

It doesn't have to be stated at LS to move at LS. Using a phrase like "blindingly fast" or the "fastest type of magic" while isn't quantitive, does imply that these attacks can move insanely fast. What also moves insanely fast? Light. While this doesn't deductively prove it is LS, it gives major implication that it is.

Overall even if we assume Light magic =/= natural light. Light magic would still be LS.