Figured this out 10 minutes ago.
Step 1: Enter a random heroic (Be in flying form and in air before)
Step 2: Mount up
Step 3: Right as the bar almost finishes for casting your mount, leave dungeon.
Step 4: You now fly slowly in the air and run fast on land. Kinda useless but allows you to fly in dal and gets a good laugh from others.
Would submit screenies but im lazy, try for yourself its not that hard. You could even probably do it just be teleporting out.