Infernal Legion and Hitboxes

I have Infernal Legion on Quadrilla tamed beast. It is a rather big monster with large hitbox. When it fights another large monster, ignite from Infernal Legion is not applied. I think what happens is that the distance created by two hitboxes of these large monster is larger than the radius of the Infernal Legion.

I have Magnified Effect on Quadrilla, increased minion area from the tree and a minion AOE jewel.

I have had similar results, while testing, it doesn't seem that minion aoe affects infernal legion area.