[tlhIngan Hol] Question about the focus / topic meaning of *-'e'*

[l.cp at web.de]

Sorry, I knew there was yet another one, but I couldn't remember it. Last question for now, I promise :-)

SaqSub’e’ muSHa’bogh
pawmeH leng qeylIS
HuDmey Sal ghIq ghIr
(paq'raD 7, 1-3)

Since there is only one noun in the relative clause, we don't need *-'e'* to know what's the object of *paw*. On the other side, *-'e'* is always optional in a relative clause. So, is it here just out of stylistic reasons, like the rhythm of the verse? (By the way, what do we know about Klingon meter?).

Thank you!