Void Grip as an escape route isn't effective if your ally can't kill the enemy quickly and you're with low HP, but you can always gain time by going below the suspended enemy since it's an unlikely thing to do. He'll delay to aim and you'll be safe.
If you spec any damage reduction on weightless that'll help. While in weightless I pop the slow flask in case escape is a better option. Standard attack and heal. About four hits should do it.