Great! Fire prevention is necessary knowledge at all times.
I remember when I was a child and on a somewhat same event, on a demonstration on a vacant field, the firefighter lit the valve of an LPG tank then we the pupils and also the teachers came scrambling and panicking as we all ran away for safety.
The moral is to stay calm. At the very beginning, adults should perform P.A.S.S. using the appropriate fire extinguisher then safely close the valve (avoid burning face/body/skin). For kids, IDK, maybe run away as fast as they can??
I think for kids we need a few adults that will run with them 😂. You know keep the chaos organised. This is why fire prevention at schools is so important 😳. As well as old age homes...