Darius was coming back from a late lunch in the mess when the explosion happened. He quickly realized he couldn't apparate. Bearing his wand he sped through the halls, casting minor healing charms when he could but not taking the time offer any serious aid to others.
Rounding the corner, he engaged a Death Eater. The duel was short. He didn't notice the other Death Eater that had just arrived. All he felt was life go out of him.