GTG rotating statue room key with action swap as child
1 backflip, turn 90, 1 sidehop+sideroll
For the action swap setup, drop a chu, sidehop and as soon as you land drop another chu, dropping the 2nd chu works on 3 frames, so you can drop the 2nd chu as fast as possible or up to 2 frames later. Pulling deku stick for the action swap is frameperfect.
A better alternative to get glitched dmg is to light a deku stick and jumpslash just before it burns down.