After this, the smug demonstrator, walked up with a smallish HALON extinuisher and gave it a 10 second blast.......then calmly walked away.
Job done.
Many years ago I attended a really basic fire fighting course ( how to use various types of extinguisher in office type environments)
Standard aircraft seats were set alight and a pair of attendees used CO2 to extinguish it.
The seats were relit, next pair used CO2 etc.
The fire was progressively more difficult to deal with as the heat was building up.
I used a quick squirt of HALON and out went the fire. I was very very impressed.
The instructor did impress on us that the job was not complete until the heat was also removed from the seats.
I immediately went and bought a HALON extinguisher.