Not sure if this one is for the firefighters or EMTs.
If a person's clothing is on fire due to a flamable liquid spill, is there a reason NOT to use a dry chemical fire extinguisher to put the fire out?
I know about smothering a fire, stop, drop, roll, etc, but in the event a dry chemical fire extinguisher (ABC) were at hand and the fire were extensive enough, should it be used?
Or, should it be avoided at all costs?
Obviously, not to be used in a way that would inhibit breathing, the posibility of injestion, etc.

Curious as to what you think or have been trained to do.