Try to coordinate with a friendly so you both ambush the same target simultaneously.
Va can take you out with 25 headshots, or in 5.
The deals considerable damage with fast but not hitscan projectile bullets.
Va without a shield tank on your team due to her own lack of shield and the short duration of.
Your ammo is infinite; her is not.
The 3 seconds countdown of is long enough for your enemies to find cover or get behind a friendly Barrier.