R.I.P Seiun and Tsuki.
While it was a very clever way of dealing with my attack, and I'll give you props for that, you forgot a single detail. Sagisō is detonating the paper bombs manually, they'll explode regardless of whether they hit anything or not. The Shuriken were thrown so that they reach Tsuki at the same time as Seiun does, and they'll explode at that moment. If Tsuki tries to catch Seiun, then the explosion will engulf them both.
If she protects herself, the explosions hit Seiun.
To properly break out of this trap you need to get both Seiun, and Tsuki outside of the range of the explosions, or protect both of them at the same time.
Of course, this is just a casual move to get you to waste chakra, it'll benefit me in the long run .3.
The most effective way I'd thought of for escaping this encirclement was to charge forward, that way Tsuki would be able to catch Seiun ahead of time and before the Shuriken had closed in on him, and she'd also be in a different position and hence wouldn't take the brunt of the explosion. Something to protect them from the shockwaves of the explosion would've sufficed.
All in all, though, your move was well-thought out, and I applaud you for it. The solutions to problems can often be extremely simple, and I like the way you're thinking. That being said, I'll cut you some slack if you want and not blow you up~