Dicey?
Myria knew that the moment these impure Ice Essence Orbs finally reached an ignition point and imploded was the time this region would be completely encased in ice, but investigating it from this close of a range, she saw that there was more time before that could happen.
She had the confidence to diffuse it.
On the other hand, Tanya saw these orbs were of varied quality. It was a testament to the tenacity of the Unfettered Ice Fiends as she learned this happened to be made from their lives from Myria while traversing here. Each of them held a massive power that would allow one to increase their cultivation base in the Immortal King Stage.
If properly diffused and secured, they were contribution points as well, and an exorbitant amount at that, especially if sold to powers outside that practiced ice-attribute.
"Guard me."