this morning on "world news now," state of emergency in baltimore. violence erupting across the city after the unexplained death of a black man while in police custody. extended coverage and the latest live from baltimore. >> it's a race against time to rescue stranded climbers on the world's tallest mountain and people still stuck in quake wreckage. the latest from nepal. >> lifesaver. the teacher in the right place at the right time tackling a student with a gun. we're hearing from his students this morning. and on last night's "dancing with the stars," one of the biggest and best performances of the season, and the showstopper was pulled off with a substitute partner. what did the judges have to say about the threesome's special dance? it's tuesday, april 28th. captions paid for by abc, inc.