That is not a rule but just a (totally optional and by no means superior) style, as is enjambment, or any slight variation to a line to accommodate your meter .. or lack thereof! The only hard rules are (1) keeping a (recognizable) repetition of the “Tri” in lines 1/4/7, (2) similar couplets in lines 1/2 and 7/8, and (3) the abaaabab rhyme scheme. So, as far as I’m concerned, no rules were broken!There seemed to be a rule I missed wherein the repeated lines are reinterpreted with altered grammar (and sometimes with a word appended/omitted). As I went back through older entries, this seemed to be observed almost invariably. As such, I wasn't sure my entry was valid because I was no longer sure if I'd followed all the rules. Re-reading the OP did not clarify this for me, I'm afraid. But it was already midnight, so I decided to simply strike it out for simplicity's sake and get myself off to bed.