Red Spears on Balbala indicates her Position in Invisible Phase

Red Spears on Balbala indicates her Position in Invisible Phase
https://we.tl/t-iNwp48qEZc I got a gif depicting balbala being invisible and she has a spear attached to her from my skill gem - Rapid Assault.
This way, I can find her easier. Is that intended or a graphical glitch?

Something similar happened to Geonor's Wolf form too. He went away into hiding, but 2 spears were on the air, but he was untargetable. The spears dissappeared after he fell onto the ground ending the lunge-attack phase from the Mist.