Highway to Hell already kills the user and target so Lovers is just going to speed up that process by 2x.

I dont get it are u asking are they dead

They're both gonna die.

Highway to hell user tried to blow hhis brains out eith a shotgun but he dint die so i dont think the stand kills u

The stand requires you to die to actually kill the target so if it was a death battle, they both would die.