placing certain types of logs and pushing forward causes the player to go up (climbing the log) and falling against it slows the player down like falling through vines/ladders.
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Using acacia logs and possibly other logs (i did it before but i don't know what the log is called) in creative, try making a really tall log totem and hold forward when falling down against the logs (test it on all 4 sides), it will slow the player down
Confirmed on Samsung Galaxy S4 Android 4.4.2 in both survival and creative modes.
I could only reproduce this bug using Acacia logs. None of the other log types worked. I tried a few other blocks (dirty, planks, stone) and also could not reproduce it with them. I could only slow down the player's descent. I could not make the player climb up the logs.
In creative: build a tall tower of Acacia logs (easier to observe the effect with more blocks but this works with as few as 6 blocks). Fly up one side so you are facing the bark surface at a downward angle (other angles work too, but this is the easiest way to reproduce and observe that your descent has been slowed down). Release flying mode and press forward on the D-pad (pushing towards the wood surface). If you have the angle right your descent will be slowed. Releasing forward accelerates your descent, but you can push forward again to slow back down.
In survival: I built a tower of Acacia right under me and backed off one side with my view angled a bit downward, then held forward on the D-pad. My descent was slowed. If I slowed my descent at the bottom, I did not take damage from the fall.
This isn't the easiest thing to reproduce every time. It seems to work best if you do not move left or right along the tower as you are falling. When trying to figure this out in survival I recommend putting water under the acacia tower until you're confident you can control your descent from death defying heights.
A simple way to test in survival is to find a savanna biome, get on top of an Acacia tree, hack off the leaves around the main trunk, back off the trunk and slide down holding forward on the D-pad. Doing this properly from heights that should cause damage resulted in a slow descent without injury. I expected to fall at the usual speed and be hurt or die on landing.
Can confirm the above description by Russle Latham for 0.10.4 on iPhone 6 plus (iOS 8.1.3). Additionally, the player can use walls, fences, or fence gates to climb the logs in question (method shown in the attached images).
Duplicate of or at least related to https://bugs.mojang.com/browse/MCPE-7745
Please provide more details on how to make this bug happen. I could not reproduce it on Android 4.4.2 in survival using acacia, oak or birch whether the logs had had vines on them before cutting them down or not and whether or not they were taken from fallen trees with or workout vines.