Well it seems Boase hasn't fully recovered from his injury. He ran tonight in the semis of the NCAAs, and only ran a 46.55. If he were healthy, he would have been expected to medal, possibly even win this event. He may have been able to medal in the 200m too. What a shame!
The good news is that Jonathan Borlee from Belgium won his semi, and from what I read on the track message boards he looked fantastic! He basically walked across the finish line and still finished first in 45.25. Guys who saw the race expect him to dip well below 45 in the final. Let's hope so.