Because, Derek, they are two different (lets call it) "feeds": marketdata (others orders, and your orders, stuff you see on the ladder) and betsactions (bets placing-replacing, cancelation).
So, possible scenarios:
1) marketdata feed is ok, betsactions feed is not - bf will void anything after api fckup begining.
2) betsactions feed is ok, marketdata feed is not - bf will not void anything even if it went inplay and now it's your fault you didn't press big red panic button to cancel everything (remeber - "betsactions feed is ok"?) in market with broken marketdata feed.