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I hope you are joking, but just in case you are not...
Your angle is too steep. The sparks are bouncing off the metal you are grinding, bouncing backwards, and the grinder is getting ready to snatch...

I use "reversed" motors on my grinders/polishers with hoods as well. With water wheels it keeps you from getting soaked. It is also easier on your neck because you are not constantly staring down you...