Like Taking An Enemy Banshee?
When an enemy banshee jump on you and when you are at the same time you will get crushed E, only if you keep get crushed leaves E and when you realize you took the enemy banshee.
The Noob Combo
To easily take down any shielded enemy, charge a plasma pistol and shoot at the enemy, it will instantly take its shields down. Then switch to a Battle rifle and shoot their head. Any shot to the head while shields are down from a battle rifle is an instant kill. This works with all enemies.