The Gates of Kryta - question

Hi all,

I'm new to the forums though I bought GW Prophecies two years ago. I didn't really enjoy it back then, but just now I started playing again. I arrived at the Gates of Kryta mission and I'm keeping in mind that I could really want Grandmaster Cartographer title later on, so I read some stuff on the internet about going behind the house near the place where you pick up Oink. I read that I could find a bit of land to discover there. So I went over there and killed a whole bunch of bad guys before I started 'cartographing' the little area. Some of you may know that there is a tree there between two stone little walls. I started clicking on the other side of the wall like a madman, and suddenly my E/Mo walked trough the right hand wall and got into an area that's supposed to be reached at the end of the mission. My 5 henchies couldn't get trough the wall, so I didn't really live all that long, but my question is: is this commonly known as to be possible? (I couldn't find anything about it on the internet, but maybe I didn't search good/long enough.)
Here are four screenshots. One screen of my map showing the way I walked, one of the 'tree and walls'-structure and two screenshots of me behind the wall with my henchies and Oink unable to get to me:









Thank you,
MarchingHome