How exactly do the 'shooting through a wall' mechanics work? Does it matter where the wall is in relation to you and the target? Does it change the trajectory / accuracy of the shot? I've tried shooting through the wall when it was very close to me and far away from the enemy, and that didn't work.
I did have one success with it - going down the staircase in the solar power plant map, there was a hovernet on the other side of the thin wall there. I shot through that wall with my sniper. The shot hit the wall, but the hovernet died.
I also tried sending a team of one sniper and one scanner back to the surface searching for the last enemy, but I found it downstairs first... the range of IR scanning one floor down / up isn't very big, is it?
(It would be nice if you actually continued to see the shot after it hit the wall, though.)