I think it glitched and made a normal slitherfang aggressive to Slaughterspine because you can see slitherfang's eyes Glowing Yellow then Red while Overridden Machines have blue eyes only
That went on far longer than I thought it would and didn't turn out at all how I expected. I gotta take another look at the Slitherfang's stats - is it resistant to plasma? That's the only way I can see a Lvl 28 machine defeating tanking so many attacks from and managing to defeat a Lvl. 45 machine.