Ok, So i was RPing with my mate, Then i mounted on my broom to fly off, and when i landed i was swimming in air but on the ground
So here is what i did, I mounted on my broom,
Then stuck it on my action bar, And then dismounted and quickly used my Hearthstone,
(sticking it on you action bar means you can dismount by pressing a button and then having your mouse ready to click on your Hearthstone fast.
So yeah, Your just swimming on the ground.