Du Youqian was, of course, already intimately familiar with Wei Wei's master.
From the combined descriptions given by the three disciples, each from their own perspective, Du Youqian probably understood this master better than the man understood himself.
Wei Wei had even reported to Du Youqian where the master had moles on his body and what postures and positions he preferred.
Du Youqian's conclusion was that the man was a genuine, petty villain—and a difficult one at that. Fortunately, his Cultivation was nothing special.
He'd heard the master was attempting to reach Core Formation. If he failed, Du Youqian could cut him down with a single strike.
If he succeeded, it would be a bit more troublesome. Without Burning his Essence Blood or paying some other heavy price, it would take two strikes.
So, upon hearing the man was coming, Du Youqian wasn't the least bit flustered. He smiled and asked, "Did he succeed in his Core Formation? Why come over now? And how did he contact you?"
