That's not too bad considering it prob has a heavy cooldown timer.

To add:

You had ample time to get to a Healer or eat a couple speckled pills. You got about 14 pulses off with movement commands, which would have equated to 2-3 heals at the Healer. It also looked like you were using 0 protections, i'm not sure if that ability bypasses things like protections, but its fair to assume that with an extra 30% dam redux, that would be down to a Demolish-Devastate.

It's nice to see Shamans taking people to town again :)