The amendatory veto goes back to the bill's sponsor. The sponsor decides motion to concur or override. Concur requires simple majority, override requires super majority. If either fails, the bill dies in totality.
This bill's sponsor, Phelps, has already filed for override. This is now a one way ticket... override or no new law.
The assembly is planned to vote the override July 9th, last day of the deadline. Surely planned this way all along.
For Illinois this is win-win situation:
If override wins, we get mediocre shall issue law - win.
If override fails, we get foid-court carry. ANY new law requires super majority because we are now in special session, so that raises the bar for any "no issue" from being passed until next year - win.