A troll is likely to end up in situations where he has made some really wild claims about something. When facts and proof is posted, the troll needs to ignore or evade that in order to keep his "act" up.

An example would be when Edwin posted about there being 830 *million* workstations sold in the first half of 2004. This number turned out to be a misprint, but the fact that the number was totally ludicrous didn't stop Edwin from ignoring common sense and kept on supporting the number.