[GAMEPLAY]Mundo Goes Where He Pleases (Into the Ground)

This only happened to me once, so I don't know which factors are necessary to recreate this bug but:

1. On Howling Abyss
2. Playing Mundo on purple side
3. While standing under my own turret (I think the inhibitor turret)
4. I attempted to activate Burning Agony and
5. I melted into the ground.

This persisted for the entire time the enemy team dove us under turret (several seconds). Burning Agony did not actually activate, although it did go on cooldown. Attempting to move resulted in Mundo flailing helplessly while half buried into the ground for a few seconds until finally appearing several Teemos away in the direction I attempted to move, still stuck in the ground. I finally came out of the ground while being killed by the enemy team and throwing a cleaver (which did go through and hit someone). Everyone in the game saw it happen, but no one was recording.

This is the Share Match link from the client, but to me it loads as a blank page so it may not be working properly.