Basically, bite the dust reverts time to about an hour.

If someone died from the bomb, and time rewinds, once the exact same time hits for when that person died, they'll be killed by an internal explosion in the same moment, even if they don't talk to Hayato.

Time only rewinds if Bite the dust activates though, the ones that die from the post loop rewind do not make time turn back.

unless the Ability is called back before, yes. he is bound to die, now if Kira for some reason is forced to recall it, the explosion won´t happen as it removes the bombs.