Good question; I like the way you think. It made me think for a little bit.
The Texas Constitution requires 2/3 of the Senators present for there to be a quorum. The Democrats didn't want the legislature to conduct business. Therefore, the Democrats denied a quorum.
There was no blocker bill in the 2nd Special Session. It was purely a quorum issue.
I realize that. I was thinking in terms of the first special session.