Burnback 2 : Flames proceeding back over an area previously extinguished, usually due to an incomplete foam cover on flammable fuels, or degradation of foam by heat or aging
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}