Not even a month into training, his Lord took Potter to train the teen himself when it became obvious the boy was nearly on par with Lucius. The only other person that had been personally trained by the Dark Lord had been Bellatrix. That knowledge had Lucius praying to Magic and his patron god that Potter wouldn’t turn back to Dumbledore and the Light. A wizard that had as much power as Potter had, with the training that Bellatrix had, fighting against the Dark was a rather frightening (terrifying) thought.