Unparryable attack during Flying Manor final fight?

[MAQUINAX]

So Im doing the Clea fight, and Ive learned almost all of her early attacks (Still havent even done a quarter of her health lol) But she has this one attack where she summons "powerful nevrons", and the last one seems near impossible to parry. I've tried every timing to parry that last Nevron that jumps at you from the background, but it keeps hitting me and removing any progress I did to the fight. Does anyone know the exact timing for when you have to parry that specific attack? Im on normal if that makes any difference to the parry frames,

[Crimsomrider]

You want to parry the moment its giant arm-walls are behind the character before smashing the ground, so basically once they're over the character's head be ready to parry.

Would be easier to watch a video on slow-mo though, explaining parry timings is a bit difficult.