Timing cutting into trunk

Two men operated a tree removal service. After cutting down a tree, they removed the branches from the trunk. Then they started feeding tree branches into a chipper pulled behind their dump truck. One man inserted a sizeable branch into the in-feed hopper of the chipper. However, the branch caught the sleeve on his shirt and began pulling him into the hopper. He yelled to his partner. Neither the operator nor his partner could stop the operation quickly because the chipper had no emergency shut-off switches on the hopper. By the time his partner got to the main controls on the engine, the first operator had lost an arm. 

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