I did a quick flip through it and didn't see anything in RQ2. Closest seems to be the section on broken lamps and fire as a weapon.
The current version and Legend have oil flask as an item on the equipment list. Legend states: "A single flask of oil is enough to fuel a basic lantern for two hours, or, if broken on the ground and ignited, enough to sustain a small fire for one minute. Oil is packaged in small pottery or glass bottles but can also occasionally be found in waxed leather skins. A skin cannot be ‘broken’ as mentioned previously – either on purpose or accidentally."