bent water pump shaft

[surfsup]

Maybe this is not a big deal, but can some one tell me what happen? spun the tires in first, hit second gear, and then it happen, the motor was knockin, after saying all the words that I could think of, the motor was fine, the shaft on the water pump bent, why did this happen? the bearing is fine, no wobble nothing loose just the shaft is bent, some one told me the belt was to tight, but I have the auto tension, and wouldn’t the belt break first? and by the way autozone 34.99 local parts store 59.99