I've seen this info floating around, but I have been lightning-attacked numerous times by hunters in my shieldless AX ships.
Again, there is a difference between the Scythe and the Glaive. Please try and learn the difference. They don't even look alike. The Scythe looks more like a starfish with 8 unmoving "arms" while the Glaive has "arms" which look more like blades and which spin around.
The Glaive is a Hunter Killer. Its job is to hunt you down, trap you and kill you. It always uses its lightning attack because the lightning attack slows you down - effectively it works like the experimental effect Drag Munitions, stopping you accelerating and boosting. It also has a passive anti guardian field which will render any guardian modules useless. It is faster than the Scythe with a top speed of 750 m/s.
The Scythe is also a Hunter but does not want to kill you or destroy your ship. It wants to abduct your passengers. It only uses its lightning attack if you have a shield and does not have a passive anti guardian field. It is slower than the Glaive with a top speed of 500 m/s.
What a Scythe does in an AX CZ if you shoot it first is irrelevant. Possibly then it will use its lightning attack in self defence. This has nothing to do with rescues though.