You clearly have never lived with tumbleweed. It dries up and will burst into fire spontaneously. So seeing a bush on fire without being on fire would be something spectacular. Just knowing that you know so little about such things reveals why you are easily manipulated by your Doctrines.
Question: do tumbleweed burst into flame
Answer: AI Overview
No, tumbleweeds do not burst into flame on their own, but they are extremely flammable and can catch fire and burn very quickly with a spark or other heat source. This is a major fire hazard in the dry, arid regions where they are common.