They were not there to do anything fancy. Just install some cameras around the rebirth chamber, it's sheer luck his Gabe is there. It wasn't even necessary since someone was already assigned to help him.
Only his Gabe was paying attention to what the other two Henries and the other two people were doing. Which let him raise a shield in time.
Then there was a thunderous crack, as the duplicating crystal cracks beneath and a spark of something more than electricity. The world glows blue and purple.