How do I use any of their grenades effectively? I can't kill with any of them. Help is appreciated.
Edit: pvp
-
Vortex - use it the most. Great for objective offense/denial. Scatter - get them in a confined area (like a hallway) and throw when ready. Axion - just make it land close to the enemy and hope he doesn't outrun the purple ball (you can also sit down and you won't be killed by this grenade).