If I was that Ziegler fellow I'd be consulting a lawyer. Spouting that shit publicly, verges (ha!) on defamation.
I'm not saying what Ziegler was right, although in this day and age, one should show very little loyalty to any corporation because they basically claim "people are our most precious resource" but treat employees like shit.
I've seen staff where I worked, take a few weeks off or take a leave of absence. What they do, is try another job and see if it suits them. They quit the original job, or they quit the new job. I'm not going to judge people too much when they do this, hell, the company is always evaluating if they should terminate you.
At this moment I have two contracts. Place A does not know of place B, but place B knows of me working at place A and they don't care. The type of work is very different and they're not in the same sector. Sure place A could claim some crap, but if they do, I just have to walk and move on to the next gig. They can claim some BS excuse anyways, doesn't matter.