The eyewitnesses to the gory scene felt like time had been slowed down for them.
It looked like someone had kept their invisible hand pressed against Oshawa's mouth. Her open mouth, which was spewing blood, looked like it had been pressed against a glass surface. The assassin had also held her body by her waist, using her as a shield to protect themselves from Gondel's potential attacks.
At this point, Gondel's entire team had come to realize it was too late to save the three rankers. The first two had already died. And Oshawa's heart stopped a second ago.
The assailant didn't even allow Sansara World's defense mechanism to get triggered. The rankers were killed before the defensive mechanism had a chance to activate. Meaning he didn't need to exploit the delay in the defense mechanism for these kills.