Defence Wolf howl on a petrefied defence units

While using paladin’s in my raiding I observed that when stone dragon spwns and petrefies enemy units …the defense Wolf as he meets those petrefied units casts a howl …thus boosting the whole wave.dont think it’s normal.

its normal, like with stun, toxic, slowdowna etc.

It is so because petrified units are treated as units of the opposing side so defensive petrified units are considered attacking units hence will be attacked at or be howled at in case of a wolf.