You mean the smoke? The pillow would be on fire in no time.
I had to use a 1mm cutoff disc recently on some thicknesser knives which are only 3mm thick. I clamped the blades between two bits of timber and put them in the wood vice. As it's my good wood bench, I didn't want abrasive shit all over it so got an old sheet and covered the bench and vice jaws. In no time, the stream of grinding sparks was close to setting the sheet on fire despite being about 250mm away from the cutting spot. Had to put a metal deflector over the hot spot.
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