Not sure what you mean by "called out".
It's not like Zamus is "tether or die". If I'm careful, I only get gimped very rarely. The most important thing is to save your midair jump until you absolutely need it. Since UpB doesn't put Zamus in special fall, she can use it multiple times, and each time she uses it, she gains a very small vertical boost. When falling, it only makes her fall slightly slower for a moment, but if used directly after a jump, you get a large boost. Her new regenerating DownB also helps out; if you need to gain a bunch of horizontal distance rather than vertical than you can use it as much as you want. Lastly, she has the "flipstool", or DownB footstool - if you press jump and touch somebody while doing DownB, then you flipstool off of them. This can occasionally rescue you if somebody is coming after you for a spike. However, unlike the normal footstool, the flipstool ignores invincibility, so you can do it off somebody who's hogging the edge regardless of their vulnerability. Lastly, the flipstool can be canceled into anything else as soon as you do it, whether it's an aerial, a regular footstool, or UpB for a boost.
THEN you can tether with your choice of Side or Up B.