Mother of god
I think it will be used as some sort of
toxic smoke screen if any of you guys think that is cool.
When it explodes it will badly damage, maybe even "incinerate" enemies caught in the radius and anyone on the other team who walks into it is slowly chipped away by the fumes, except for Firebugs of course.
Think of it like a toxic cloud that doubles as a tactical cover thin, and also for quite literally smoking out bunkers.
Oh and since I've been talking about Artillery or Field guns WP might also be used with them to, though it will be alot more painful than a little grenade.