I suspect what is intended by divert is that he was trying to get back into the plow to regain control vs trying to externally stop or change its path.With bare hands, wasn't it easier to get his nephew rather than getting the snowplow!?
I really want an animation to understand how this thing happened.
The exact wording of the police report:
Per https://www.darkhorizons.com/renner-saved-nephew-in-snow-plow-accident/ which quotes CNN.“The machine began sliding, causing Renner to exit the vehicle without setting the emergency brake. Although the PistenBully had some mechanical issues, it is believed based on our mechanical inspection, that the parking brake would keep the PistenBully from moving forward. When Renner attempted to stop or divert the PistenBully to avoid injury to [his nephew], he was pulled under the vehicle by the track and run over.”