As of today, you can throw a grenade, and if the timing of your dodge is perfect, you can farm it to go into Super Reflex Mode. This means you can use your ammo effectively to have the arena's upper hand. However, it would be best if you were careful of the chaos in the arena. The game may efficiently compute your dodge to an enemy laser target instead of your ammo. For this reason, I strongly recommend trying this trick when you're not near other enemies.