There is no particular reason for high pressures to develop in the cylinder as a result of the engine coming to a sudden stop. It seems a lot more likely the flywheel key has sheared, and the ignition timing is now hopelessly wrong. I suggest you check the key and keyways.
In the case of a car engine, sometimes they come to a sudden stop as a result of water in a cylinder, caused by a blown head gasket. The water causes the sudden stop - the sudden stop doesn't cause the water. Incidentally if that happens while the car is in motion, there is little chance of saving the piston and/or connecting rod. If it happens while the engine is just cranking, most times no harm is done. However I can recall a couple of people who have managed to ruin an engine with a hydraulic lock, by towing the car and engaging the clutch. In one case with a Holden grey motor the center main bearing cap ended up laying on the bottom of the sump. In the other case it was a brand new diesel 4WD that got a drink while crossing a creek. Attempts to rotate the engine by towing the car resulted in a new piston, rod, and crankshaft. Wasn't covered by warranty, either.
