There is no way for the casual observer to know if the foot injury contributed to the missed throws unless they know exactly where and how his foot is injured and then it is still up for debate - and I don't remember hearing anything specific about exactly where and what is injured - a foot sprain covers a lot of ground. The foot is a very complex set of bones, ligaments, tendons, and muscles. Some movements and pressure can be almost pain free while a similar motion could be excruciatingly painful or very uncomfortable when an injury is present. And it differs from individual to individual. Think of a back injury with possibly more moving parts in a smaller area.