I repotted a new sans that about a month ago, because it was almost in standing water when I bought it.
In the process, I accidentally broke off a shoot that was still white and had just started it's journey upwards- I'm not sure if it had any roots attached or not.
Feeling guilty, I put it in a small pot of soil, just as an experiment, and left it in a corner of my plant area in my bedroom, where I promptly forgot about it.
I checked it out today and was shocked to see a little green nubbin poking out at me!
Perhaps you really can't kill these plants?