Pieces of steel in cylinder??

Cuda416 said
Ah, I mistook it for a roundhouse to the back of the head. My mistake..

Lots of ideas, so far it looks as if @George Jets is probably right. At those times when the crank bangs the bearings, there will be metal on metal and a LOT of heat which would easily melt that tin in the bearings.
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When the seat disintegrated and then the piston hit the valve insert material, then the oil that is used for the boundary layer lubrication can get squeezed out and then the bearings go metal on metal and the bearing material will shear/smear...