Copied in ThunderAxe31's latest stuff on the end of this movie. I didn't check if it contains lapogne36's stuff, though in my brief look I didn't see anything new.
So, now that I have used a Fragile Barrier against a boss, and successfully done so, I can feel satisfied in defying the words of some random person on the internet. Despite, you know, these words most likely talking about dealing with the endgame stages on decidedly finite ammo, and not in an environment where we have far less need for it, but let's be honest. We like twisting meanings around and making them somehow fit a different perception and then claim it was that all along.
Aw, now I went all meta and can't spark some kind of debate on what I actually did. You guys are going to smile too much at this.
Used spikeball shot as finisher instead of star, simply because the damage output was only just barely keeping up with the sub-HP. Star would not have done enough damage. Also, I technically avoided damage, in the interpretation of never getting an ouch animation, by using barrier and taking hits with that to disable my hitbox detection. This was enough to reduce the lag. Additionally, the Fragile Barrier was used against the boss as a single projectile that doesn't lag much.