flying in survival

i was playing an adventure map
and i was walking around normally
and thought nothing really...

i then suddenly went really fast...so i slid up on the D pad like in creative to fly...and i flew

Steps to Reproduce:
1. umm i started up the cursed village map
2. its at http://www.minecraftforum.net/topic/2219638-the-cursed-village/page__hl__+dropbox#entry27183856
3. heres video proof http://www.youtube.com/watch?v=0ZukMMrc8RA&feature=youtu.be
4. i went up to a house
5.i suddenly went real fast
6. so i tried to fly (coz you normally go real fast when flying on the ground)
7. and i was flying...