If you stand at the bottom of a wall on fortress and switch to mortar mode you can aim just at the very top edge of a railing to hit guys on the other side of the railing at that spot. Just got a bunch of multi kills on wall defenders doing that from spots where they thought they had cover.
Thanks for the heads up, messing with the mortar can be fun but a headache, not even getting into shots that swing JUST enough overheard to cause superficial splash damage
