Many people would be surprised how effective a multi-purpose dry-chemical fire extinguisher, discharged in the facial area, can be at short range; it buys time to skedaddle and/or to reach a more effective and permanant solution or, in and of itself, may resolve the issue. An advantage is that it can be openly mounted and close to hand, yet appears to be innocuous.
If I were contemplating using a fire extinguisher in a defensive role, I would remove the tamper seal that helps prevent accidental discharge and mount it such that it could rapidly be dismounted and deployed with one hand.
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