An ordinary electric box-fan - even of the fairly large size that Red is using - would never have anywhere near enough torque (turning force) to crank over a big 3-to-5 horsepower lawnmower engine.
No cutting-blade is visible through the mower's clippings-ejection-chute - just the fan-blades. So the lawn mower obviously has had its blade removed prior to supposedly being "cranked" by the electric fan.
The chainsaw-contraption on the front of Red's "all-terrain vehicle" is obviously not running, since the car merely knocks over the saplings at root-level; it doesn't shear them off at the level of the cutting-chain.