There is this topic from last year:
http://www.friendsofhabanos.com/forum/topic/123830-to-re-light-half-smoked-cigars/?page=1
Ethernut, when you say "a relight" what time frame are you talking about? A few minutes after going inside to, um... mix another drink? A few hours like Cep mentioned? The next day as Arnold claims? In my experience even serious purging before, clipping, and purging after a relight still leaves you with a cigar that tastes like it was re-lit.
I just realized, of course Arnold relights his cigars days after; think of all the terminator sequels he has been part of! Sadly, like T2, T3, T4, T5, etc, there always seems to be a decline from the first fire.