Sigh, I was that injured climber. Embarassing.
At about 1:15pm on Saturday, I attempted to lead Hobbit Couloir, and took a fall onto a 13cm ice screw. During the fall, a crampon point on the outside edge of my right foot caught briefly on right side of the couloir, twisting the foot outward. After the fall, I ended up on the floor of the couloir, having gently impacted it, with most of the fall force having been absorbed by the rope. I realized at that point that my right ankle was injured and I needed to self-rescue, so I cleaned one of the two screws that I had in the top portion of the route, then hobbled over to the bolts on the left side of the couloir that are typically used by parties doing the rock finish of Pegasus. I anchored myself, put my second on belay through the top ice screw, and directed her to downclimb the couloir while I kept her on belay, rather than risk lowering her from the top screw. She volunteered to first clean another screw that I had placed in a grade 3 section above the belay, which I agreed to. In retrospect, I should have told her to leave that screw, since cleaning it put her at more risk of a fall, and her belay, running as it was through a single ice screw as the top piece, was of questionable integrity. But she climbed up, cleaned that screw, then downclimbed out of the couloir without incident.
After she was down, I directed her to untie from the rope, pulled it back to me, leaving the top screw in the ice, and I rappelled from the bolts. After rappelling, my partner and I evaluated me, and the only injury seemed to be my ankle, which could not hold weight. So, I packed snow in the boot (which felt quite nice!) and started carefully glissading down to the railroad tracks, using two ice tools, one in each hand, with picks downward for fine control. During the glissade, I met Chris and his partner hiking up. After a brief discussion, they followed me the rest of the way to the railroad tracks, and then Chris rigged the dragging setup that he described to get me back to the parking lot, which worked out quite well and was fairly comfortable for me, with low risk of injuring my ankle further. I'm sure dragging also got me back to the car much faster than if I had tried to rig a makeshift crutch and/or hobble out on my one good leg supported by my partner.
After driving to Memorial Hospital and getting the ankle examined, I was x-rayed and diagnosed with a fracture of the medial malleolus, splinted, and discharged. I will pay for my hubris with 8 or more weeks without climbing.
Regarding Chris's comment about not evaluating me for a head, neck, or back injury before dragging: given that I had been glissading for quite some time with no visible discomfort or loss of control, standing on one leg at points on the way down with no balance problems, and my conversation was completely lucid and oriented (by my standards, at least!), I think it was pretty reasonable to assume that I had no other injuries. If I had just pancaked to the ground in front of him, that would be a different story. But meeting me, as he did, already pretty near the tracks, smiling and joking about grooming the trail with my butt? I guess you can never be too careful, but that doesn't strike me as much of an omission on his part.