Saw a twitch streamer building last night after he killed my killer, he decided to use a rifle for the last kill. The other guy could not get near him, he got him on something like the twentieth shot. His SA was amazing, he seemed to know where the other player was at all times, even behind multiple walls. He was building at a speed which seriously had me questioning whether it is feasible to do that with a select/place two button press. I am positive that there is a trick to it, even when it becomes second nature there just is no physical way to place that quantity of structure consistently without a mistake for that long. Edits were instantaneous - that supposed to be a three button press, but it was literally a turn, click, half wall. Of course you'll get fast if you do it all day, every day - but that was mind blowing.