That was from straight up collapsing their civ and absorbing the leftovers. Tribute kind of requires a civ to still be standing though, so I assume that wasn't what we were discussing.
That being said, if we
do collapse another nomad empire in its entirety, I would indeed expect a chance to absorb a bunch of Light Cav (maybe even more this time, since it's a repeat performance.) May require an even bigger stab hit though, as I imagine people are
pretty pissed at the Forhuch for being dicks. Nomad sentiment is probably at an all time low.