VIDEO: Two firefighters were injured battling a quick-moving fire at a South Boston duplex Wednesday evening. South Boston neighbors returning from work and school became panicked as they turned onto East 7th Street to see the fast moving flames. “We heard screaming,” neighbor Geoffrey Spooner said. “Everybody is running up the street. We just started running toward it. I’m banging on doors and banging on windows because there’s two houses right there.” “It was real bad,” neighbor John Walsh said. “The flames were out the second floor windows and shooting out to the street and up above.” The fire started in the left side of the building, which is under construction. Neighbors say work crews had just left for the day.