The gallows intrusion, the baseline jumps and multipass

[ReneZ]

But is the word jumping the intruding gallow, or is the intruding gallow taking up the space left by the jumping word?

Exactly. You may want to take a look at the three examples I listed. I think they are 'at least suspicious'. Already the fourth I have doubt.

The scenario I had in mind was not so much related to odd/even lines, but rather that occasionally a full line is written, and more frequently just the first few words.