This may be more of a research question, but it also involves some creativity. I have a scene where two characters are fighting. During this conflict, some clothing of a third character catches on fire somehow. This may be as a result of the conflict, or fire may already be present in the environment. The two characters fighting are not human, they are better described as monsters. They cannot produce fire, but have access to other powers. The third character is a human. The setting is 1:30 am outside in an urban setting - streets, cars, alleys, etc. The fire does not have to be large. It just has to catch some clothing on fire. So it may be just a spark. I simply do not know enough about objects in this environment to be sure how a fire could realistically start. For example, could a street light be damaged in the struggle that shoots sparks and starts the fire? Also, I could move these characters from the outside to an interior environment. I was thinking a church perhaps. It would be a good setting, and there could be some lit candles. (I'm not sure what kind of church is open at 1:30 am and has lit candles) Any other suggestions would be appreciated. Thanks for your help.