The black plume of smoke Laurie Sharpe spotted during her morning walk Monday looked like it could be billowing from a backyard burn. It was what she noticed next — thick orange flames reaching into the sky above a home at 10813 N.E. 38th Ave. — that sent her rushing to see if anyone at a threatened ranch-style house needed help. There was no one outside, but Sharpe could see a walker on the front porch. It took four rounds of knocks before Donna R. Davis unlocked the door. Sharpe said the 86-year-old woman was reluctant to leave, wanting instead to stay and protect the home against flames that could be seen advancing. Davis planned to push back a fire engulfing a fifth-wheel type trailer with a garden hose.“I said, ‘I’m sorry, ma’am, but smoke kills. We’re getting out,’ ” Sharpe said.A pastor at an area church, Sharpe said she navigated heavy black smoke to haul from the home a crate holding a black cocker spaniel. She said she then had to push Davis outside. “Fortunately, I was there,” Sharpe said. Davis was unharmed but shaken, said Dawn Johnson, a spokeswoman for Clark County Fire District 6. As crews worked to put out the blaze, Davis went across the street to a neighbor’s home. “She’s doing well,” Keith Garder, the neighbor, said of Davis. “She’s not hurt. She’s upset.”Smoke visible from mile awayFire District 6 firefighters reported they could see a large plume of smoke as they left their station on Northeast Hazel Dell Avenue, more than a mile away from the fire.