In better news, a quick AnyDice query tells me Usagi can pretty much keep this up until the Rockets start getting to her...
...Or until she gets tired of teleporting. The most similar event like this in the past was when Usagi was rapid-teleporting and casting heal-bombs during the Uminari Tree Incident, and that did start to get her tired and disoriented fairly quickly.
Well, Moon could always just teleport to one of the Ongoro armies.
Really obviously. Using the spell that makes every rocket in the sky retarget onto her.
Of course, in theory she could equally well teleport to them holding the warheads of the rockets she's breaking in midair. But either she hasn't thought of the enemy's explosives as a weapon to use against Onogoro soldiers, or she's having trouble keeping track of where the ground forces are while being catapulted and whirled all over the sky.
...One thing, though. I suspect this little "rocket garden" violates many laws. Many, many laws. Even ignoring that they are missles being used by insurgents, what we got from Serenity and why she was so against shooting them down reads like serious animal abuse.
Well, we've seen at least one viewpoint scene from a Hinoyama clan member's own perspective. It doesn't sound like the training method for these little guidance-spirit things is necessarily animal abuse
in and of itself (at least, no more than training a dog to do tricks by feeding it treats when it does things right would be). But loading the spirit into a missile chassis and throwing it at the enemy could be argued as animal abuse depending on your definitions.
I like how Flailingly Whirlingly Teleportingly Mobile contributes more to this roll than Significant Spoilers.
In this case, knowing how the spell works is less important than being practically impossible to target and lock onto, I guess.
How things have changed. At the start of the quest Serenity was the driving force pushing the childish crybaby Usagi to be more. Now we have reached the point where Serenity, naive over-pampered brat, is an active detriment.
I don't think that's really fair.
Serenity's problem or 'problem' here is that she's a gentle pacifist who was historically guarded by some of the most powerful warriors who ever lived, so she has, as Usagi's internal narrative puts it, the fighting instincts of a head of lettuce.
At the same time, being a gentle pacifist doesn't mean being lazy, unmotivated, or stupid. So Serenity can still be a powerful force for making Usagi
productive, and even helpful in inducing Usagi to find her courage and be brave, while being actively a drag anchor on Usagi when Usagi is actually trying to
fight.
The problem here is that 'Greater Moon Sparkling Sensation' specifically requires
Serenity's mind casting the spell or helping to do so, and Serenity is of very limited use on a battlefield. Notably, Moon Sparkling Sensation still works as a typical magical girl combat spell without Serenity, it's just not something you can use to laser-shotgun stuff from three miles away.
Also kinda concerned that Serenity cannot differentiate between Shukra and Minako, despite living in Usagi's head.
To be fair, Minako is known to Usagi as a scrappy warlike powerful combatant that Usagi has a lot of faith in as a fighter, so the difference in Serenity and Usagi's minds may easily blur a little. Serenity would have, I don't know, centuries of memories of Shukra, whereas Minako is very much a new thing to her.
And we know Serenity's ghost has trouble with realizing that she's dead and it's the postapocalyptic future, because we've run into basically that exact thing twice now at a minimum.
The BIGGEST most scathing criticism about this update that I can level is - there is zero under-the-hood explanation (read - rolls and or trait activations) as to why Usagi's flopping so badly against first sniping of the rockets and then snapping them in halves.
Like from the moment Old Princess Serenity butted into the SAM action, it's been a desire for explanation that burned inside me.
And I was denied.
Seems simple enough to me. We ran into a limitation of Greater Moon Sparkling Sensation, so Usagi did her best to accomplish her objective via the other means available to her. Her best turned out to be pretty good, albeit very undignified.
This kind of thing is very rarely covered by dice mechanics in the quest, because the dice rolling engines are mostly present to
guide the narrative of how well certain things work, not to provide a detailed D&D-style mechanical simulation of how every one of dozens of possible combat tactics behave.
Wait, wasn't the reason the Senshi are holding back because there was some concern about the god binding system? Shouldn't they just blitz the hell out of the enemy HQ now?
Usagi: "Great idea! Uh, where's the enemy HQ?"