Are we looking at a hung jury?
That's the prevailing wisdom.
I think it's too early to tell, and we don't know enough. Maybe there is a good faith effort going on to persuade the one or two or three who don't see self-defense. There is no signal that negotiations have broken down, other than it's taken three days so far.
At this point, if I was foreman and it was clear we had one or more dug in, I'd tell the judge that at least is dug in, and won't budge even faced with the facts. But I'm quite impatient, and this foreperson may have the patience of Job.