User blog comment:Mufasarocksyall/If Mufasa could talk to Kion via cloud, why couldn't Scar talk to the Outlanders in the clouds?/@comment-25028958-20191120013131

USHARI: According to Rafiki, the evil lions' spirits appear in fire.

Kion's angry roars summon bad lions' spirits, meaning that he can summon Scar.