What's getting my out of flight form? World PvP

[Deleted]

Just as the topic says: doing some world PvP, sometimes my flight form gets canceled by other players' abilities. No idea what can knock me out of a flight form. Any ideas? Usually there are a couple of players so I can't narrow it down to which class does it. Shattering throw from a warrior maybe ? Any ideas?

[Mellow Cricket]

There is an item that drops from a rare in Pandaria that dismounts people (including flight form).

Edit: It's called "Hardened Shell" and it drops from Nessos the Oracle, Great Turtle Furyshell, or Chelon.

[Deleted]

There is an item that dismount players but it shows with a casting bar when they start using it, otherwise i got no idea.
http://www.wowhead.com/item=86584/hardened-shell

[Deleted]

Thanks guys !