Shooting at the projectile of the core eject shotgun with most weapons will detonate it and create an explosion which can be used for boosting.

However, doing so with the malicious railcannon allows you to stack the knockback of both explosions for an even greater boost at the cost of 50hp.

• For a vertical boost, fire the core eject shotgun above you and step back a tiny bit.
  
  

• Shoot the core eject projectile when it is infront of you with the malicious railcannon.