memory stones in heat

Knobblyville is currently in the claws of a heat wave, but at least my workspace is always nice and cool. Apart from my personal preferences, this has a very important reason: while the books in my collection don’t care whether it’s hot or cold, the memory stones react very badly to heat. They tend to get instable if they heat up and it might come to the point where they explode. Not something you’d want to happen in a HoK.
As I was musing about that yesterday, an Imp came running into the library and straight towards my reference desk. She was carrying a memory stone without a protective chase. I sprang from my chair and headed towards her: “What do you think you’re doing. Carrying a stone without case and in this heat!”
“You have to help me! The stone is instable and I can’t cool it down and this was the nearest place I could reach. I think it’s going to explode,” the student answered hysterically as she hurried nearer.
My gaze went back to the stone she was carrying and saw immediately that it was too late; the stone would explode within seconds. My assistant was coming towards us from the shelves so I screamed at him to weave a protection screen around the student while I hurriedly drew up all my strength to form a protective bubble strong enough to hold the escaping magic.
The enormous wave of magic exploding out of the level 3 stone hit the student and ripped her off her feet. When the free energy slammed into my shield, I could feel my power draining out of me, but the bubble held.
Once the outward momentum of the magic was gone, it was relatively easy to put the magic into a newly created stone, that I put into my pocket.
A look around confirmed my suspicion that my assistant had gone down as well. The magic wave had to have been too much for him to hold off the student completely. I knelt down by the student and scanned her body with my magic. Thankfully, she was just unconscious, no bigger damage had been done to her brain.
The Imp opened her eyes and I asked her, “Are you alright?”
When she nodded I let out my frustration. “What in the name of all the gods were you thinking? DON’T EVER BRING AN UNSTABLE MEMORY STONE INTO A HOUSE OF KNOWLEDGE. You could have started a horrific chain reaction. Do you have any idea how much magic you could have set free? The whole city could have died of a brain fry!”
“I… I didn’t know what to do…” whimpered the imp.
That was the moment I decided it was high time that I came up with a new compulsory tutorial for all HoK patrons. I intent to install it ASAP, before some idiot actually does blow up the whole city.