ZW Lightning Blade and Leo Arms

My field:
Utopia with equipped Tornado Bringer and Lightning Blade.  Also a ZW - Leo Arms.

I attack with my Utopia.  Opponent activates mirror force.
Does my Leo Arms die since Lightning Blade goes to grave (Lightning Blade has an effect where ZW cards can't be destroyed) or does it stay alive since Lightning Blade protects it at the same time it was sent to the grave?  A lot like Rainbow Ruins ruling or Mecha Phantom Beastcrafts.  Curious.

https://www.youtube.com/watch?v=14I48_kInVY
A video where I posted and was curious what should've happened.

Lightning Blade will protect Utopia from Mirror Force and the attack will go through. I do not understand why would you think Leo Arm will be destroyed as well (if it's equipped to Utopia).

 If it's not equipped to Utopia then it will be destroyed because Lightning Blade is no longer on the field.

Gotcha.  Basically, send Lightning Blade to grave.