[spidey]

Exactly what Gretchen said. Corrections should be used when the dog a) fully understands the command being given and b) does not respond to the command appropriately when it should reasonably be expected to do so (i.e. when the command is issued clearly and the dog can reasonably be expected to have heard it). Why did you correct the dog in this case? Some dogs simply will not accept unreasonable and unfair treatment, and correcting a dog for no reason counts as both unreasonable and unfair, and from the sounds of it, that's what happened here. I think you're correct that the remote collar DID provoke this bite from what you've said.