I've gone into the fight like 14 times and the coldsnap has never purified while the heal-block that is also applied at the start was getting purified

I doubt i'm just getting unlucky, but I cannot figure out why it isn't purifying
In videos of other kingpin vs iceman matchups, he purifies the coldsnap, but none of the nodes on this particular fight would cause such a thing, and nothing I can find in his abilities that may have been added in his buff can explain it either.
Have I overlooked something obvious?