Chadwick Boseman's final performance in 'Ma Rainey's Black Bottom' might be his finest yet

Ma Rainey's Black Bottom opens on what looks like danger: two small bodies sprinting through the woods at night, panting heavily as dogs bark after them. Just as we brace ourselves for the worst, however, the meaning of the scene changes. These Black boys aren't running from horror but toward pleasure, into a tent where a crowd...