No, he fell into the slipspace portal [i]under[/i] the Composer, it sent him back to Installation 03 where he was confronted by John and Blue Team in the 72 hours following Halo 4's campaign. You can read the full story arc here: - [url=http://viewcomic.com/halo-escalation-008-2014/]Part 1.[/url] - [url=http://viewcomic.com/halo-escalation-009-2014/]Part 2.[/url] - [url=http://viewcomic.com/halo-escalation-010-2014/]Part 3.[/url] He does end up being Composed into a digital essence, so he is removed as a threat [i]for now[/i]. But [url=http://i1072.photobucket.com/albums/w362/Chronarch7/guardians20_zps3f0ivtkp.png]an interesting size comparison graphic for Halo 5[/url] depicts what is quite clearly the Ur-Didact, but with disconnected joints and cobbled together parts. With the Domain now confirmed to still be active, we actually have the distinct possibility of healing the Ur-Didact's mind and turning him to humanity's side. So it's going to be interesting to see what happens.