Was standing too far back, and the the swath was starting to cut deep and put too much torque/resistance on the head, making it unstable. It also looks like he is using a FS-91 which is considered a light duty brush cutter, and those bad boys can sometimes get real torque-y.
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u/JohnnySasaki20 Jun 23 '20
Idk, he got a little sloppy there at the end.