[Gameplay] Mordekaiser ghost pet (Azir and Anivia), not moving

When Mordekaiser ults Azir and kills him, he can or cant receive instructions neither from R or ALT + click, about 80% of the time he won't move as directed, won't move, won't attack, unless it automatically follows your basic attacks for primary target (doesnt work everytime anyway) it has happened as anivia as well, but not as often as azir

on another note, Mordekaiser's ghost pet, can get feared from Volibear's roar (is it a minion or monster?) also can be shielded by janna (is it a champ?) and ALWAYS tanks turrets before minions, is that intended?

also... no rioter has been able to explain to me, when does the ghost target your primary target? (anyone you basic attack or Q) sometimes i want it to follow someone, half of the time it does, not sure what do i do that he comes back and when the ghost will not come back