Where does it show that he is trespassing or illegally hunting or doing it in an unsafe manner?
I"m not taking sides on this, just answering your question. If he is hunting/shooting an upland game animal, which a tree squirrel is in some states, it can be illegal to stalk game in a vehicle, which he is clearly doing. Also, if the road is not a private road, he cannot shoot within 150 yards of the road.
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