He shouldn’t have withdrawn the motion until he actually had the materials. At the very least, make the DA show up and state in front of the judge that the material would be produced without condition.
This is the way that lawyers do business with other lawyers. This guy is behaving in an ethical manner as an officer of the court. The DA was not doing this, but he has apparently gotten some good counsel and has backed off.
The reason for the refusal for signing the release is that it might have established a precedence for something that was not in the statute. Many more little squabbles to come. Reyna lost this one.