Icicles and mastery proc?

[Blastazzar]

Does anyone know exactly how icicles interacts with a mastery proc?

I got a azerite talent on my leveling gear the other night that gives a mastery proc, I thought it could maybe have some fun potential with a GS build. I then realized I wasn't sure how to effectively use the proc.

If it procs while I'm building the icicles, but falls off before I cast GS will they benefit?

If it procs before I cast GS but after I've built all 5 icicles, will the icicles retroactively benefit?

Or what if it procs as a GS is travelling through the air?

I'm just not sure when the size of the icicle is determined. Is it when it is built with frostbolt/flurry, or is it when it is fired off with a GS/lance, or is it perhaps when the GS/icicle actually lands on the target? Does anyone have any idea how this works?

[rogoth]

if you get the proc, you spam 5 frostbolts while it is active, the icicle dmg is stored regardless of procs/modifiers so no need to worry about losing dmg, then just fire off a GS when you have 5 stored, with the change to how icicles function, they are now a flat amount of damage modified by int/mastery/versatility, and once an icicle is stored it retains whatever damage value it had at the time the frostbolt is fired off that generates it.

[Blastazzar]

Thank you very much for the clarification.

That was my first assumption to how they worked, I second guessed myself though, because they took out dot snapshotting a while ago and this is kind of a similar "snapshotting" mechanic for the icicles, so I thought maybe they would work differently. Good to know, I appreciate the help mate.