Purging

in Cigar 101
How many of you guys do this? I discovered it not too long ago and am finding it very useful for when a cigar starts to get bitter* down towards the end. (for those that don't know, purging is when you blow out through the cigar while lighting it and a blue flame emits from the cigar and you continue to blow out until the flame goes out).
Comments
And I don't understand about the relighting part. I do the blowing out bit occasionally when a stick starts to taste bad but I've never tried relighting at that point. Maybe I'm just a little dense.
Marty