[X] Covered Retreat
-[X] X and Argalia Will Stall
Correct me if I'm wrong, but I don't think that Sayaka or Mami are durable or have enough firepower to survive an extended fight with the Adult Who Tells Lies. X can try to shield them of course, but the Adult possesses deadly ranged and area-of-effect abilities that allow her to apply constant pressure to X and the Magical Girls simultaneously. She can launch attacks all day long, but we only need to slip up once for one of the girls to end up like Homura.
Kyoko has a higher degree of durability due to being Distorted, and we've seen that she has enough firepower to counter some of the Adult's attacks.
I think that this went surprisingly well, actually. There are bound to be significant civilian casualties from the initial attack on the neighborhood, and Mami's house being destroyed is bound to be traumatic, but everyone rallied against the surprise attack rapidly and effectively. Notably, Argalia not only showed up to reinforce us, but also managed to intercept and apparently neutralize the Adult's reinforcements enroute.
I'm not sure if retreating is the best option, to be honest, now that we're no longer in an area where collateral damage is a large concern. The Adult took us by surprise initially, but now she appears to be exposed without her fortifications or her allies present to help her.
...It's unclear how exactly we'll fix Homura, but out of all the Magical Girls for this to happen to, Homura is probably the one who'd take being skewered and partially dismembered the best. That's not a good trait to have, exactly, but it's useful in this situation.