Actually Dave is the one who made it 3/4 up the sub dome. Dave is not as sure footed as the rest of the group and has been known to slip occasionally. Dan who did summit was the one who became ill. He also had the same illness on one of our local hikes up Mt Rose (above 10,000). Dan is not as experienced as the rest of us and had increased his strength and endurance greatly the last 3 months. However he has never been up Whitney and I think he did not properly hydrate and fuel his body on the HD hike. We certainly gave him good advice and information as we trained this summer. I think he has learned a valuable lesson. Here's a link to my full video of our Half Dome hike. I'm not sure where or how to embed it.
https://vimeo.com/49423239
