The burning question is where is the other 1/2
Had a customer with a Lawn World 60" that did that with the middle blade taking the right one with it + all 4 spindle bearings .
Couple of weeks latter he was complaining I did a bad job because the deck was shaking .
Same story 2 broken blades + 4 new bearings , big argument about "warranty " so I just charged for the parts .
Third time I asked him where it started to happen and sure enough there were 3 1/2 blades in the grass with chop marks in them .
Ex-customer demanded a 3rd set free under warranty I told him to piss off .
He made a complaint to the consumer affairs but I had the photos of the blades as found in the grass so that got nowhere .