The Motherlode's 5/10 Damage "Bug" is Holding Fuse back immensely

Before I was of the thinking that it was a "bug" that caused Motherlode to do 5/10 damage to an opponent instead of burn damage and allowing them to escape the fire. With my grind to to Dia IV with Fuse on Stormpoint, it has happened so frequently that I'm adamant that Respawn intentionally placed it there. I've even put a Bug report about the ultimate doing 5 damage and it was ignored.

I've lost countless kill points due to enemies taking this 5/10 damage and running away. Seeing them take 5 damage and walk straight through the fire is not only downright depressing, it's punishing to myself and other Fuse players. I've had this scenario occur multiple times on the opposite side where an enemy Fuse ults me and I hear the ultimate noise and thought "I'm ******..." -takes 5 damage & runs through Fire- "...?" -runs away-.

I'm not sure why no one has talked about this major downside to Fuse since it prevents his kit from working how it should. If you're punished for timing your ultimate to hit enemies with the edge fire then it just means you're punished for using an ability.