DPS bug in Delve 11, 9+ mill. DPS singel target as Prot.

What happened here? Our tank had insane DPS..

Is this normal, or a bug?

Delve 11, The Dread Pit.

Prot. Pala, Frost DK and a Shadow Priest.

Short vid: [https://youtu.be/NZp08h3E0IU](https://youtu.be/NZp08h3E0IU)

Long vid: [https://youtu.be/v748Vov5Kjs](https://youtu.be/v748Vov5Kjs)

Edit. Added links..