How do stumble mechanics work?

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I unlocked an ability in the third tier of SWAT perks. It says:
Increases stumble power 100% with all perk weapons.
What exactly does this mean?
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How does stumble work Back 4 Blood?
Stumble is a mechanic in Back 4 Blood that determines a weapon's ability to interrupt any affected enemies and whatever action they were currently doing once enough stumble damage is built up.What is stumble power?
Explosive weapons apply incapacitation power based on the target's distance from the center of the blast - the closer a ZED is to the explosion, the more incapacitation power will be applied. Stumble: Stumble is an affliction that causes a ZED to stagger backwards, temporarily impeding its ability to move and attack.How does Stumble work and Why did it get \
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Images: Miguel Á. Padriñán, Miguel Á. Padriñán, Miguel Á. Padriñán, Miguel Á. Padriñán