Unfortunately jumping people coming off of the BB is a way of life in Avalon. It always has been, especially with the preception skill that tells you where they bb'd.
What you have to ask yourself is was this a premeditated attack, did Threap deliberatly come to your location, or was he there when you returned, and made a split second descision to attack you.
It happens to everyone at some point, myself included, doesn't it Allanon?
Written by my hand on the 8th of Cloudburst, in the year 1010.