Sailor Mercury and Sailor Mars in Monochrome

The Sailor Senshi are running up the stairs in the Starlight Tower to get to Usagi and Mamoru, who are trapped inside. Suddenly, things get psychedelic. Well, that's what the backgrounds look like anyway. :P I believe, as Ami explains later, things go wacky because Zoisite disconnected their reality from one of the 3 dimensions. Eh? This cel is after Sailor Mercury and Sailor Mars turn monochrome.
Key Cel
Matching Background
Sailor Moon Episode #34
Shining crystal! The moon princess returns
Hikari kagayaku ginzuishou! Tsukino princess toujou