"Part of that euphoria stemmed from a month of training in an Ethiopian village near Addis Ababa at 9,000 feet, with some runs up to 10,000 feet. However, that followed a period from October to December when Hall could not run due to a hip injury."
http://www.runnersworld.com/boston-marathon/ryan-hall-had-higher-hopes-for-boston
I am disappointed Ryan mistimed his injury plans for his Boston build-up. Clearly if he injured himself later he could have had a DNS like his fans want.