Hi, in the sandbox world I made a trap (I learned it on Thursday evening from my 5th grader 1-2-1 student who'd...

Hi, in the sandbox world I made a trap (I learned it on Thursday evening from my 5th  grader 1-2-1 student who'd read about it in the Redstone Handbook, it was a lava trap, I slightly changed it).
Should you get trapped, here is a tutorial on how to get out. 
Sometimes the trap doesn't work, I don't know why ... Filip Smolčec  might be able to explain :D 
#evomc15  
http://www.youtube.com/watch?v=aRnv2lK81KE