Angle grinders will 100% fuck you up. The blade is made of compressed metal dust, so it can erode as it grinds away at whatever you’re cutting. But it also means that the blades are prone to shattering, because it’s basically just dust and glue held together by a wire mesh. The resulting shards are often moving so fast that they can embed themselves in solid concrete.

At the very least, OP would be missing their nose or an eye, and would have a giant chunk of metal embedded in their face. That’s the best case scenario. If the blade hasn’t shattered and is still spinning, then you have something designed to grind incredibly hard materials actively grinding away at your skull. And if they were working alone when this happened, (it sounds like they were) they’d probably bleed out before anyone else found them.

As someone who has done a lot of construction work, I say this with complete certainty: You don’t even want to be in the same room as an angle grinder unless you’re wearing a face shield.