As has been mentioned on this thread, he didn't eject to save himself.
Absolutely proving the relevance of what I wrote about people not commenting unless they've heard all the evidence
That's not necessary for all legal matters. In this particular case, for example, the judge would have gone into a lot of detail about the exact legal definition of what manslaughter by negligence is.
The only time that the jury would have had to leave if something prejudicial (or potentially...
When I did jury service, the judge warned us not to listen to friends/relatives offering opinions on the cases we were trying as "as no-one could possibly comment unless they'd sat in court and heard every minute of evidence."
It's really, really good advice