Engert's success and downfall both hinged on his Plate Armor.
Without the Plate Armor, Engert wouldn't have been able to pressure Sword Seven to such an extent.
For instance, the first arrow that hit wouldn't have stunned Sword Seven if Engert had been wearing Leather Armor.
Instead, he might have been controlled by Sword Seven's Charge skill and faced defeat.
Unfortunately, Engert hadn't anticipated Sword Seven suddenly unleashing a wide-range skill with a high frequency of attacks.
If he hadn't shielded himself with his arms over his head, a few hits would have caused him serious trouble.
But Sword Seven seized this opportunity to close in and launch a continuous barrage of attacks.
True, Sword Seven couldn't inflict severe damage on Engert, who wore Plate Armor. But Engert's high Defense Value came from his equipment; his physical constitution was relatively weak.
