Rattle snakes will almost always warn you of their presence and that they are unhappy with your’s. Copperheads are silent.
I lived in NC for a few years and the very first time I mowed my lawn, I ran over a copperhead that I hadn’t seen with the mower. From then on, lawns were always mowed wearing long pants and boots. I saw dozens of copperheads over that two year period. Very beautiful snake...from a safe distance.
Did the blades get it or was it low enough in the grass to sneak under?
Poor 'journalism'....the term is "antivenin".
A friend of mine was bit by a Copperhead this past spring...looked out the door and saw his daughters puppy trying to “play” with the snake. He reached for the dog and it struck him in his hand....spent 4 days in the hospital.