Even though Phantom looked like an alluring beauty with a seductive figure, Leon knew that she was a master of illusions. Therefore, his brain consciously ignored her beauty when he looked at this female Mage.
Who knew if she was hiding a fat, ugly body beneath that shell of seductiveness and beauty!
Leon could have used the unique penetrating ability of his elementium sight to look at Phantom's true face. However, an invasive probe against an opponent of the same grade was undoubtedly offensive, and was very likely to invite hostility from the opponent.
Whenever there were other Mages around him, Leon would consciously shut off his active probing abilities, only allowing the chip to do passive auxiliary information gathering.