"Disentanglement (new specialization): Causes shapeshifting to remove roots in addition to snares"

I was healing the last boss in vortex pinnacle and expected to be able to shift out of the static cling, as I'm resto and have the new "Disentanglement" specialization, but I was unable to. My guildie who was in the group at the time had run VP on his boomkin earlier and said he was able to shift out of the static cling. So, I tested it back in org with a guildie who speced into Imp Hamstring, and as resto I could only shift out of the slow, not the immobilizing effect, but as boomkin I could shift out of both. Anyone else encounter this?