Rui's strategy was simple. Catch them off-guard with Greater Phantomind Void and Death's Sympathy soon after he drew them out with the tier-five Transverse Resonance, and take out as many as possible.
He had hoped to take out three of them before he was booted out, but he knew that that was pushing it.
Contrary to their expectations, he never intended to use Greater Phantomind Void throughout the entirety of his fight. For one, it consumed most of his attention, making his reactions to attacks slower.
On top of that, they had two wide-scale Martial Seniors who could cover a lot of area with their attacks, Greater Phantomind Void was useless against such attacks, since they swept through a lot of area, hitting him regardless of whether they could sense him or not.
In a prolonged fight, he would probably still come out on top since spamming wide-scale attacks was a good way to burn through stamina, but there was only one problem.
This wasn't a duel.