I have encountered this same problem. I took the contorted remains to my local tobacconist for examination. Along with some unsmoked samples. He said the problem is rare but does on occasion happen, and is a problem which originated either at the time of rolling, boxing, or shipping while still in the country of origin. He explained, that this was due to an evil spirit becoming trapped in the cigar and released when while the cigar was being smoked. The physical aspect of the being, while not 100% tangible is enough to make the cigar to "swell" or expand as it is released. As voodoo or other misc. practices which deal with such beings are perhaps more common in the cigars country of origin, that is the most probable source. You should not have this problem with the other samples as a spirit would not be divided into two different cigars. So the chance of two spirits being in the same 5-pack is of course small. Not being an expert it is difficult to say exactly which spirit infested your cigar but according to tradition each spirit has its preferred fruit or vegetable, color, number, day of the week, etc. However in the interest of you continued piece of mind and safety of your other cigars (there is always a possibility the spirit was transferred into another cigar) you may want to consider a general offering performed in the vacinity of your humidor. This should be repeated every Monday and on the third day of the month. Favorite gifts are candies, candles, toys, rum and cigars. As an aside this may cajole the spirits to protect you from tobacco beetles.....I hope this helps. It seems to be working for me as I have had no recurrences.