gearshift48
With a single motion of the staff, far faster than the expanding gas of the plasma grenade, it passes through its body with easy, sniffing out the expanding matter into its body, in the manner the staff's done plenty of time, no explosion happens.
The sword however does hit the Inquisitor in the back, piercing his lower abdomen region, though something seems wrong, it was not as much as it was pierced, but actively stopped at a spot. Soon cracks form within the sword as it fades into literal dust, the energy that formed the weak atomic bonds of its material was likely absorbed to the Inquisitor directly due to its proximity to his body, and the fact of it being a very archaic form of attack.