Isgebind's Sheet of Ice AoEs don't Heavy you. They paralyze you if you didn't get out of the cast, but the ground AoEs just do damage--the debuff doesn't last once you leave, unlike the Frostbite from Cauterize (check out this goon standing in everything, but do note the footage is old, so the ground AoE debuff isn't in the floating text like it is in the game now).

The Gravity Node's AoEs are super noticeable since they apply the debuff if you enter in. It's not like a typical ground AoE damage effect where you'd just be gambling with tick timing. Good thing the Heavy isn't a big deal... usually.