[quote=booksmusicanime]
I can't do much about it because Lexie can't really be Grey's character's weapon because I don't think she's a one handed weapon
[/quote]

Depends how big the Flamethrower is.

If it's small enough, it could easily be used as a sort of hand-cannon/tonfa combo. And yes, I'm aware the image shows a guy wielding it with two hands.