Toz felt a few wisps of flame sneak inside the orb right before he closed it. Thankfully, he managed to control and put them out before they could touch anyone and cause damage. However, he couldn't get rid of the heat that easily, and the orb turned into a makeshift sauna.
But even when the inside of the orb was dizzyingly warm, Toz and the others could still tell that it was worse outside. The others didn't know that Toz's void metal was even better at shielding them from the heat caused by the magical explosion than most other metals, so they only thought the heat was dangerous, but not shockingly so.
However, Toz knew how effective his void metal was when it came to blocking magic. He could also sense how much the explosion had worn away on the orb. But even if Toz was the only one who knew exactly how powerful the explosion was, it didn't mean the others weren't thankful for the orb.