Prolonged drought conditions are forcing British Columbia’s fire tacticians to rethink how they battle blazes in the province’s dry and hot Interior.  As huge, destructive blazes spread across the southern Interior, many are burning across land that has already experienced fire over the last decade. In years past, the BC Wildfire Service would expect previous burn scars to slow, or even stop, the progress of a new fire. But this fire season, a prolonged drought has upended that assumption. Firefighters’ experiences could have implications for what British Columbians can expect from fire seasons for years to come. …A burn scar “used to be something we could use as a control line,” Chapman said. Current conditions, though, make those scars untrustworthy. “The fire behaviour can be almost as extreme in some of those old burns, depending on their age and how severe the burn was.”