Given you have taken over 200 shots and only one shows this 'split' and that nobody else can produce a similar image would strongly suggest it is an artifact in the image. The large distance between the 'two pieces' if this was an actual break away would have occurred over several minutes at least and should be captured by others, I don't think it would go un-noticed. Given the large distance between us and the comet itself we are practically viewing it at the same angle everywhere on the planet. I also agree that such a large piece would not disintegrate so quickly that nobody would have seen it, and in between you taking more photos. The fact it is not elongated like the 'main' comet head also suggests it is not part of the comet.
Nice 'spoof' shot though, worthy of some award for "McGaffs while viewing the best comet of our very short century so far" ...
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