That's it, someone heeya needs to make a TRUE Zelda character description instead of this one.
EdiT : Actually, if anyone wants to get me a good pic of black dress Zelda in this angle and pose ^ in the desc. picture, (On this stage too, why not. It has a godd background.) I would be very much obliged, as It has good potential as a black dress Zelda w/ salt shaker pic. :D
So this image just shows a few different states of the move, and not the closest intervals you could catch using 1/4 (Hold L) right?
Well, let's see, the reflector starts on real frame 18 (Via the frame speed multiplier altered for the first 12 frames to be x1.5, thus > 18 frames.) so I sort of answered that myself, lol.
The intangibility start trigger must've been altered in designing this move, (If it really does start intangibility on frame 3-5) as if it were a completely raw ONLY frame speed change to the startup, the intangibility would start around frame 7, and it obviously, does NOT.
Also, whatever frame total the intangibility actually lasts (Whether it was the same "till the hit-box" or different from the standard variation.) its duration would be mulitplied by x1.5 as well, so its intangibility should be decently longer than Nayru's Love (As much as 5 frames) Sort of getting a little carried away here I suppose...
Unfortunately, the mastercore doesn't have the data for when her Nayrus' intangible frames start and end, but one way you could try to find them is like, make a video of a move being used in 1/4 speed, and then slow down the video recording as well and possibly get very close estimates by counting the visual frame changes? I mean, an old Brawl video showing Zelda's dsmash arm glitch did something like this and was able to show the arm's apparently 1 frame long glitching very clearly.