Corvus Glaive’s persistent charge doesn’t activate

1ST_PLT_M3D1C

Corvus Glaive’s persistent charge doesn’t activate following defeat of Spiderman (Orig. & Miles Morales) and Spider Gwen by Special or Heavy attacks in T4 Basic and Science quests. I’m using iPhone SE, iOS 12.1.3.

Eb0ny-O-M4w

They need to evade once in the battle.
You need to knock them down with a special or a heavy.
You can't kill them in the same heavy/special. That is a knock out, and not a knock down