Jack used Shooting Dash. Ursa was surprised by the sudden burst of speed. Jack's claw weapon punched into Ursa's body when he was still dazed.
Unfortunately for Jack, Ursa's shadow form triggered the small chance that caused Jack's punch to just phase through without causing damage.
Jack didn't fuss about the misfortune. He used his second dash to move away. This time, it was Vivian who was surprised when Jack suddenly appeared before her. She instinctively put her shield to defend just as Jack's punch came striking.
It was a normal punch, but Vivian was still blown away by the impact. She again wondered how a beastmaster could trump her strength to such a degree.
Jack used the third dash to get back to Ursa, which caught him off guard again. He wasn't aware of a movement skill that allowed a player to zip around multiple times.