Dianne Feinstein said earlier that she was supposed to "stay and hold the floor", whatever that means...
"hold onto the floor" maybe? Oh sorry, that's Chappaquiddick Ted.
I believe that means that all the other democrats had left the floor, and she was to stay. Because if she left, the majority leader could ask for unanimous consent for a vote, and there would be nobody to object.
So the democrats have to make sure there is at least one person from their side in the room at all times.
This also points out that the democrats are not there listening to anything even THEY are saying.