Terrible and sad news, in so many ways. Wishing Bennett the best and swiftest possible recovery; wishing strength and hope to his family members, who are surely stricken, and to his colleagues at SFS.
UPDATE (2:10 p.m. February 25): Various reports indicate that the paramedics were in the hall within 6 or 7 minutes of when Bill Bennett was stricken. No word from SFS today on his condition.
UPDATE (2:27 p.m.): More details in Joshua Kosman's Chron article.