First.. I get their first fleeing. They are greedy cowards and didn't want to accept the consequences of losing elections. So be it.
But once they negotiated a return, it should have been done for the session. I would strongly argue that this second cut and run should invalidate all deals made on the first return. Everything that was promised and/or delivered to them is now null and void, and should be called back for votes as soon as possible.
Second.. Keep up the fines, start the special session as soon as legally allowed after the end of the current session, keep it open as long as legally allowed. And keep calling sessions and having state police searching for our lost senators until they can be returned, as long as it takes.
Third.. Lets get on the residency requirements. How long does it take before they are legally considered to have taken up residency elsewhere, or at least given up residency in Oregon? What are the laws surrounding Oregon State Senate members who move to other states?