Turb sees Soda go in the direction of the Rec Room but doesn't seem him enter it. The direction of the Rec Room is also the direction of the Kitchen/Dining Room.

I'm assuming that Soda dragged Yuno's body there and lit the fire, since only he would have known beforehand that Yuno would be knocked out and not be able to light it herself. Then he enters the Rec Room proper to do his mayhem in there and bursts out later.

soda is... the innocence! soda not kill the yunos! look look looky

You taze the first figure, and then the second figure: a torch weilding Yuno. They both hit the floor with a thud, and you continue onto the REC ROOM.

soda... not move the yunos!!! soda not murderer! soda is the innocence!

current theory:
turb makes deer mask, drags yuno to bear and lights the fire for her, before tossing her on
returns to draku, takes off mask and sets it outside rec room, then drags draku into gym

( L Y N C H T H E P I S S E R )

Yeah, that explains the mask and how Soda didn't see him but he saw Soda (even though that's inconsistent)

Turb's account was also written last and doesn't really have any new information in it or prove anything either other than who the figure in the Gym door was (which doesn't prove him innocent)