It must be Troll Season again, not so much on UKP (although we do get them) but I've noticed a few of late. You also get them in real life turning up at Moots, Study Groups, trying to get into your Coven/Circle/Hearth.
A very good essay on how to deal with them can be found here.. Although written primarily for coven based witches, the general principles still hold true and can be applied regardless of your path or the structure of the group in question.
In an ideal world, you'd never meet a troll. In reality, there are all too many out there.
Wassail
Karen