In another alternate in Undertale, Zaydon was fighting against Shiva as she was ready to kill him.

Aura Zaydon:  Give up, Shiva. I won't let you hurt anyone in this universe.

    Nightmare Shiva was laughing sadistically at her brother's alternate  counterpart and begins to attack him as she created the spikes out of the ground and grabs his soul.

Nightmare Shiva:  I'm more powerful than you, brother.

Aura Zaydon:  That may be true, but I have the upper hand.

    Shiva was confused until she saw three Gaster Blasters behind Zaydon as she was scared.

Aura Zaydon:  TAKE THIS!!

    Zaydon's Gaster Blasters fires blue flames at Shiva as it consumes to nothingness. He looks at the spot at where Nightmare Shiva was defeated and saw footprints to the ground as he decided to relax for a bit.

Aura Zaydon:  Sometimes, I wished that you were gone.

    In the darkest part of the forest, Shiva was breathing heavily as she took some damage from Zaydon's attacks and lies herself next to the ground.

Nightmare Shiva:  Relax Shiva, we'll get him next time and find a more worthy opponent than him.