A portable fire extinguisher can weigh anything from 1 to 30 pounds (0.5 to 14kg) and that could dent a skull adequately to kill someone. A discharge of a chemical or foam extinguisher in a confined space already compromised by a fire could reduce the oxygen level enough to cause asphyxia and kill someone.
The short answer is, yes. A fire extinguisher can be used on a person if the fire is directly on them and spreading quickly. There are still specific steps and safety precautions that should be taken when using a fire extinguisher on a person. There are multiple factors to consider other than using the fire extinguisher to put out the fire.
Fire Extinguisher Safety – Poison
Proper use of fire extinguishers is generally safe; however, there is some risk for mild respiratory, skin, or eye irritation. Use in areas with poor air flow, use with intent to harm someone, or intentional inhalation of fire extinguishers can produce serious toxicity and would require medical evaluation.
It may not have sufficient powder to properly extinguish a fire. …. If the gauge reads above 205 p.s.i., the extinguisher is overcharged and the dial will be above the green section. An overcharged extinguisher may not interfere with the discharge process, but it may damage the gaskets of the hose and cause leakage.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher