script/dungeon/encount_think.lua - idle animations used in Gridless Floors?

The script/encount folder, as well as script/event/other/encount_ev/, contain scripts used in Gridless floors.

Ragged Mountain (first visit) - sankankaidou
Ragged Mountain - sankankaidou_back
Hazy Pass       - kageroutouge
Stompstump Peak - tontonyama
Inflora Forest  - shikisainomori
Glacier Palace  - guressha_in
Ochre Quarry?   - dangai
Holehills       - fuuketsu