Hi mates, from time to time, my highlander team like to mess around on the maps of the week on UGC, for: planning pushes, counter pushes, holding positions, good traps, sentry placement, good hiding spots for surprise attacks etc...
When I find this very dangerous potential "exploit", well all know that most of this grids allow damage to pass, we know them from: Steel, Fast Lane, and others, my team like to call them "Chicken Pen".
When the Blu team have it's further spawn position (after capping 3rd), in front of it's spawn, there is on the roof a "Chicken Pen" the top floor, is the last point hold, with a nice timed trap, it's possible to devastate the Red combo on the top floor.
Here is a screenshot to help Schwa to fix it, note that the Red Heavy took damage from my Black Box as you see that 15 Health is returned from the hit.