I have no idea what this guy did or how he did it..."BUT"...why post it on social media before you get answers from the shop? One "possible" explanation, in my mind's eye, was the "chopping" was successful but the knife "possibly" got stuck, as things do, in the crotch of that limb and the chips "popped-out" when the customer twisted it, back and forth, to get it "un-wedged"!
Either way: Not the tool I would have used but let's see what the final outcome will be.
Best, Capt. Chris
PS: I accused "nothing" and used the words "possible" as well as "possibly" in my post...Just sayin', CCS