Avengers actor Jeremy Renner, you may have heard, ran over his own leg with a large tracked snow plow. Lost a lot of blood, nearly died. Is in critical condition. I only mention this because it is hugely important to AVOID INJURIES during this time when hospitals are suffering staffing shortages and supply chain scarcity for many medicines.

Although we don't yet know the cause, I can tell you from experience that all these heavy equipment machines have extensive safety features. It is almost impossible to run over yourself unless you have failed to do something such as put the machine in park, deploy the brake, take it out of gear, etc. Most likely this accident is USER ERROR. You have to treat these machines with huge respect and a touch of fear, because they can tear you up in a bad way.