I think that was poorly done for the Mekakushi dan intro episode. The anime is beating around the bush too much, I feel like the episodes are trying more to meet the time tables with it's drawn out animations, now quite annoying because of Shaft's persistence in trying to make still-frames interesting, rather than make the time worth watching.
I felt like the scene where Momo and Marry petrified the terrorists was underwhelming, they should have put more effort into showing that they were petrified.
12 episode limit, it's looking grim.
Worst case scenario the anime will cliff hang somewhere around Takane's death and reincarnation into Ene (hopefully the transition from current to past day will go well, but seeing how that's all flashback it's going to be a dubious reproduction), which means viewers will be left without any real answers and get a bad impression of Kagerou Daze. A truly lamentable outcome.