I don't trust Hijiri. If she escapes, she's too big a threat.
I know this isn't exactly canon PMKM, but PMKM is an example of the murderous shit Hijiri can pull off.
I'd love to let Hijiri go, for her to appreciate the gesture and go live a happy life and not hurt or attack anyone again. I heavily doubt she'll see things that way.
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I have low hopes for Anri. Oriko's the closest canon has to a Social guca. I'd ask her to help Social Anri; if she doesn't feel confident, I'd just Gem Anri for now.
Then we can re group, go home, put Hijiri someone where she can't escape, then reconnect her and try to talk.
[X] Gem Hijiri.
[X] Simultaneously:
-[X] Ask the Pleiades to pick up Hijiri. Explain she tried to escape.
-[X] Ask Mami to guard Hijiri until she's picked up.
-[X] Go face Anri alone.
-[X] Ask Oriko if she could talk Anri down, and what does she need in that case.
[X] Grief armor underlayer., and protect your Gem.
[X] If Oriko answered...
-[X] No: Gem Anri with extreme prejudice.
-[X] Yes: Try to comply if Oriko had any instructions, and buy time for her to arrive.
--[X] Potential actions (Anri):
---[X] Re-introduce yourself. Apologize for earlier.
---[X] Ask about her. Who is she; what does she want; why does she believe Kyuubey.
--[X] Ask Mami to provide sniper support, outside hearing range, just in case.