Amumu Ult and Death bug

The animation goes off and the Amumu Ult circle goes down and stays down for the REST of the game (viewed by all members in the game) as shown in the . This has happened 3 times now, and seems to be possibly driven by a 'Latency' Kill where my Client and others view the Ult going off but the servers having maybe a 'Tie' from Ult being completed and the Mummy's death.

Not sure if the final result should have been the ult being processed or everything just disappearing. Riot can figure that out in their spaghetti code. Thanks!

-Sad Mummy