But that's not the point. The point is: my env_dynwall tiles are NOT appearing when I trigger them! [screenshots below]
http://lh3.ggpht.com/_EL6CffcEkeI/SpckluoJibI/AAAAAAAAABg/PXebXY8b1oo/ed.png
http://lh3.ggpht.com/_EL6CffcEkeI/SpcklJBjtYI/AAAAAAAAABY/_BKzb2WbhZA/he_surroundv1_00003.png
I've the trig_start thing trigger all of the wak entities [the env_dynwall tiles] at the beginning, but when I try to manually trigger them again, the black tiles 'appear'.
Oh, and it seems that you can shoot through walls if you're in a corner. Check it
http://lh4.ggpht.com/_EL6CffcEkeI/SpckleIzUfI/AAAAAAAAABc/rY3vMvwzy1U/he_surroundv1_00002.png