Dread Servant Spectre; Shield Wall Interaction

For some reason Dread Servant Spectres make it their life's purpose to immediately target and destroy walls created by the shield wall skill gem.

I have no problem with this occuring when a spectre like Death Knights slam the wall destroying it. But usually that's a happy accident. I do not know why Dread Servant AI immediately targets these walls, but it feels unintentional considering the behavior of other summons; even among the strange behavior of other spectres.