At this moment, Vladimir's eyes gleamed fiercely; no wonder this fatty targeted him at every turn, it turns out he was the very opponent Vladimir nearly battled during the FCA Alliance War a few years back. Understanding this, he could now make sense of it.
Indeed, he had planned to teach those people from the Yate Federation a lesson, primarily to vent his sister's anger. After all, Mirami was young at the time, and those people were ruthless in their actions, which was something Vladimir could not tolerate.
Furthermore, as one of the Heavenly Kings of Hell's Gate, he was also keen on testing the strength of the federal soldiers. Sena's genetics were inherently superior to those Earthlings, and as part of the allied forces, Vladimir did not trust the allies' strength to be reliable, seizing that time to also display his might.