When in doubt,
ask Mami. Would that work,
@Redshirt Army?
[X] Act. Visibly restrain yourself. Agree verbally to leave her alone, but ask what she tried to do, first. Keep Riona unbalanced.
[X] At the same time, signal Mami to tag you and Homura and have Homura activate her magic.
-[X] If Riona is somehow included in timestop:
--[X] Act first: Detain Riona with Grief Fog, take the Gem, threaten to break it.
--[X] If
anything goes wrong, no holds barred. Purée her. Save the Gem unless Riona
still tries to attack.
--[X] Otherwise, continue.
[X] In timestop:
-[X] Consult Mami on the danger of tripping Riona's shades. Explain briefly. Employ Grief hax if needed.
-[X] Leave, convene with Mami and Homura.
--[X] Make sure Riona remains time-stoped at all times.
--[X] Things went wrong, get Sayaka and go to Oriko's. Insist if needed.
--[X] Get Kirika to enchant everything you might need to antimagic Riona, Gem and body.
--[X] Explain eveything. Avoid Social Bombs.
-[X] Plan (listen to opinions):
--[X] Blast Riona and her surrounding area with Anti Magic (Sayaka and Kirika).
--[X] Use Anti Magic restraints on Riona and her Gem.
--[X] Restrain Riona completely.
--[X] Mami and Homura know their roles better than you do.
-[X] Enact plan.
[X] If Riona's successfully restrained, don't drop timestop:
-[] You need sayaka to try copying her magic, but before bringing that up, you need to ask her whether she decided to learn the 'secret' or not.
Tentative last line, I dont know if it's too much to add just like that.