AFAIK the legs are Hardox. Can't see how you bend them that easily. We have not bent one yet and we are on rocky ground.I have one and I'm annoyed at how easy it is to bend legs , it's hard to do a days work with out bending some part of the tip or leg. And it wasn't in rocky ground . Also in that video you have no shin guards on the legs , helps it do a clean job , but it will wear the legs through in two days.
Driving too fast?