Is this intended? Thalnos bug

Been pvping with thalnos and ofc people are using ancient of war. I used to just cycle my low spells anywhere until i noticed that if it’s redirected, thalnos isnt vling up nor getting the attack speed buff. Sure you could say just have the spells on the aow but i play on a small phone and sometimes i would have to constantly swipe up and down to put down a mini and then return to the aow location. Dunno about you but if i play a spell, redirected or not, it should still buff thalnos.