DK grip/slow on healers in BGB

I’ve always played DPS in BGs, so never had to think through how to keep a blood dk from gripping me off the map with 0 support from my team, as a healer. This happened 3 games this morning where they would grip me to lava, into the lava, endlessly. Then in EOTS essentially off the map. Again, no support despite asking. I’m low rated as heals, is it me for being terrible, or on my team for zero help?

Disc priest, shield/feather does nothing. What else can I do if I’m gripped away from a team fight vs this?