Conversation so far:
What is the DC Rebirth?
the new DC continuity relaunch, DC Rebirth.
When was the relaunch?
in Batman #19.
Did it recieve any recognition?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Blackmailing the approaching guards with details of their children and families, Riddler walks out freely before intruding into Joker's office.
What does he do then?
Riddler seemingly offers the Joker a partnership, acknowledging that if either of the two men individually kill Batman, the other will be left forever unsatisfied.
Does Joker accept?
the Joker shoots Riddler in the stomach and quickly departs.
does riddler survive?
Left in a pool of his own blood, Riddler rose to his feet and limped out of the office, seemingly unfazed.

Question: What happened after that?
Self-contained rewrite: What happened after Riddler limped out of the office?