In choosing roles, “Underground” star Aisha Hinds sometimes thinks about the words of poet Audre Lorde: “Sometimes we are blessed with being able to choose the time, and the arena, and the manner of our revolution, but more usually we must do battle where we are standing.” Hinds ruled one of the most revolutionary episodes of television this year — a stellar hour of WGN’s “Underground” in which Hinds, as Harriet Tubman, delivers her aching life story and unstoppable manifesto to free former slaves from bondage. The actress, who also plays Pastor Janae James on Fox’s “Shots Fired,” said she realized the influence a role could contain when she played a homeless woman named Isabelle on the TNT show “Hawthorne.”