If a player was to hold down on the screen without moving camera and was far enough away from. Any blocks then walks forward while holding the screen to break a block whatever the block is right in the center if using slpit touch is broken instantly as if in creative
I can confirm that this particular method of reproducing "instant break" works every time when you try to do it immediately after loading a world. At some point after messing around a bit, I can't reproduce it every time any more... Samsung Galaxy S4 phone android 5.0.1 MCPE 0.12.1.