Parvati/AUROR Williamson.
in their last push into the great hall i was dueling yaxley, and mr diggory came up to help. yaxley kept trying to use the killing curse on me, and kept missing somehow. we traded spells for a bit, then he put me under imperius but it didn't hold either, and eventually he summoned me to him to use me against mr diggory. yaxley was taunting him the whole time trying to kill me in front of him because of cedric and the pressure point that is on mr diggory.
some weird spell bounced off the armor and hit mr diggory in the back, and that's why he's recovering from. i ended up breaking away from yaxley just enough, but he was going to point blank kill me. mr diggory killed yaxley to save my life in a pinch, even though he was just about to pass out/bleed out himself.