The Flush is a ranged attack not entirely different from Rebellion's Drive ability. The power of this attack isn't entirely different from Drive either but this ability is much faster to perform. This attack requires no charge time and there's little time afterwards where you need to recover yourself. For this reason, this attack is generally preferred except in situations where you are attempting to stop a Raging enemy like the Ravager.
A useful quick combo for a large group of enemies uses this in combination with the Osiris. Target the leading edge of a group of weaker enemies and use this ability. This will push them back into the group a little bit. Follow that attack up with the Streak ability to hit and stun most of the group. You can then follow up with an Osiris combo.
For added damage, after performing the Streak attack, switch to Aquila for a Buy In, jump into the air and perform a Stomp with Eryx to stun the enemies before launching all of your enemies into the air with a Raze. The Buy In will bring all of your enemies into a tight circle and then the Eryx can quickly stun them all in place giving you the time to charge your Raze attack. Once in the air, you can perform any number of attacks with Aquila, Osiris, or Rebellion to keep them airborn and deal massive damage.
