If whatever you hit killed the engine or stopped the blades,( which would probably stop the engine) it is a chance the blade only hit the object once. There is also a chance that it did not niche the blade. So, yes I think it could happen without niching the blade. I ran up on a ground rod sticking up about three inches one time and it immediately stopped the engine and the blade was not damaged at all. I was lucky of course that a spindle was not broken or something else. Also if you hit the blade nut you will most likely have to heat it to get it off. (but that wouldn't have cut the rod I guess)jbell113 said:It may have been the bolt but it made an awful raquet grinding and knocking. The blades cut 3/4 of the way through the metal stick that was in the ground. Now that I think about it I think the metal piece that was in the ground was a solid aluminum pipe ...maybe that would explain why the blades werent nicked up. Sorry for misinforming every one but the blades still are fine.