kinda weak at this one...

I've seen that there's something tricky about this demon who shoots kinda magical sphere like something?....through the middle of its horn...

It may be handy if u observe it properly ....it shoots

Angularly;not in a liner way like archers..so,best trick will be..if u keep urself closer to the demon and deal meely or grenade damage...

(better not use ranged weapons to defeat it)

The closer...the better