Zpots read this passage from "the tell-tale heart": i thought the heart must burst. and now a new anxiety seized me – the sound would be heard by a neighbour! the old man's hour had come! with a loud yell, i threw open the lantern and leaped into the room. he shrieked once – once only. in an instant i dragged him to the floor, and pulled the heavy bed over him. i then smiled gaily, to find the deed so far done. but, for many minutes, the heart beat on with a muffled sound. this, however, did not vex me; it would not be heard through the wall. at length it ceased. the old man was dead. what does poe use to speed up the pacing and increase the tensio in the passage?