User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-33939194-20181229062541/@comment-33939194-20181229101050

But didn't Issei already show this kind of improvement when he fought Vidar? Issei was using his sword in combat and also Vidar had a style of acrobatic of complex kick that made it hard for Issei to read him. Furthermore, Issei defeated Vider using tactics. Since Infinity Blaster and Longinus Smasher wasn't enough, he used Ascalon and Ascalon II when he saw an opening to take Vidar out?

So what's the difference between his fight with Vidar and his fights with Kiba and Rias?