#killer cold

this cold is killing my nose. it’s itchy, tingly and driving me crazy but i just can’t sneeze… so i had to induce them.

I think the difference is that Caitlin's powers fall by default on the scary and negative end of the super powers spectrum. The Speed Force is a neutral force that we've even seen punish speedsters who use speed for evil. Super speed is just there, at a speedster's disposal. But Caitlin leeches heat out of her immediate surroundings because she's losing her own. Killer Frost's kiss killed the Earth-2 robber but not Deathstorm, because his tremendous heat is enough to counteract her extreme cold.