Crossbow Master: Snipe /K: /J:スナイピング
Type: Active
Description: Snipe a target with a killing shot. Cooldown timer decreases as the skill level increases.
Max Level 30: 11 MP,cooldown time: 15 seconds
Comment: Snipe will always one shot kill the enemy no matter what HP they have. It does not work on bosses, of course.
Okay, found what I was looking for.
Apparantely, people didn't understand that it doesn't 1hko the boss, but instead simply does 100k dmg. :/
I didn't seem him using anything besides Strafe that whole time.