Don't worry, I have plenty of experience when it comes to weapon effects and targeting. Like quite a few on this forum I also got reasonably good at chucking practice bombs at ships by day and by night. So no, no assumptions needed.
Returning back to the thread, the Argentineans did a pretty good job of getting dumb bombs into RN ships, despite rather rustic systems and the RN shooting back. If the 13 bombs that hit but failed to go bang had fused correctly then the outcome of the RN to continue to operate would have been challenged. I'm struggling to think of an occasion where a ship has survived a correctly functioning 1000lb bomb. I guess it must have happened but it would be a pretty rare event.
http://www.naval-history.net/F62-Fal...ships_lost.htm