Sheffield grinders always grind with the wheel going away from them, it is lubricated with running water and the slurry flings 4 feet high up the wall.
The bolster is held underneath a hinged board when the grinder sits on the board all his weight comes down forcing the edge onto the stone. The stone is huge and going very very fast. In the days of natural stones they occasionally exploded often killing several people but modern stones are all man made synthetics.
After the main primary grind has been put on the secondary grind is done by hand and eye.
and a final tidy up on a belt sander. It takes significantly less than a minute to grind the bolster primary grind and secondary grind on both sides. This makes a Tormek look a bit of a toy.