Watch where the Bucks score their 3s. Looking at the basket. Nine o'clock, between 4 & 5 o'clock, and once in a while at 3 o'clock. The only variance is when Holiday puts one up at 7 o'clock, but that percentage isn't good.
The Nets were taking away the 4/5 location, and pressuring the 9, so Connaughton wasn't hitting. Their shots were coming from all different angles to the basket where their percentages are low. The Nets did that by shading them to keep them out of their preferred rhythm to the spots.
I forgot to mention. Khris is dead on from the 7 hole, but was pushed out of that area constantly now for three games. When they failed to keep him out, he could hit the 3 at that location.