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From The PSUPedia
Blowdown is one of the side-effects of certain skills or bullets. Unlike a status effect, the enemy does not gain a certain status, but undergoes a physical action, which may impede its ability to strike back at you. The effect is also known as knockdown or wipeout. An enemy can not be blown down while it is already executing a manuever (casting a tech or doing a special melee attack).
The sort of physical impediment the enemy undergoes depends on the enemy itself. But usually the same category of enemies undergoes nigh-on the same side-effect. It also sometimes depends on where you hit the enemy (from behind, the side, or the front), as to how effective the side-effect is.
- Small enemies: These will 'trip up', and fall on the floor.
- Medium enemies: These will fall flat-out on their back or belly.
- Large enemies: The effects vary. Most common are flinching, tripping and falling over
Combinations of side-effects
By using blowdown repeatedly on a large enemy which can not undergo blowdown, blowaway, or launch, you can stunlock the enemy. If timed correctly, the enemy will keep flinching while taking damage from your shots, and will not be able to take physical action. It will die without having been able to retaliate.