Venkateswarlu (Ranganath) is a fire officer, who slaps  Devudu when he set a marketplace on fire and as continued throwing kerosene at the marketplace.
The passage describes a scenario where Venkateswarlu, a fire officer, reacts to Devudu setting a marketplace on fire by slapping him and throwing kerosene at the scene. This highlights the severity of the situation and the consequences for Devudu's actions.