Asensy
** SPOILER **
STEP 1: In the "Emergency Stash" room, pick up a "slippery serum", which is located under the stack of holy water flasks. You will eventually need both of the slippery serums found there, but you can only carry one at a time.
STEP 2: Drop a slippery serum at each end of the log (one at the top, and one at the bottom.)
STEP 3: Move to the center of the log to push it off the branches.