I use a variety of swing draws, sometimes a swing/spread draw. I am hunting with a white bow. I had 4 deer less than 20 yards from me with no cover between me and them, I drew on an 8 point buck that was a bit further away and to the side. I saw that I had too many branches as I was doing the straight back finish to the draw and let down. The deer in front of me did not spook. The doe looked but then went back to browsing the picked corn. My normal 25 yards and under shot tempo is one second from the beginning of the draw to release, I aim longer on longer shots. Perhaps it is a shot timing thing, but I do not have problems of deer busting while I draw. I only hunt on the ground. I have taken several deer standing with my back tight up against a larger tree. It is possible to shoot accurately without leaning away from the tree using the swing draw. It does alter where the secondary 'imaginary' aiming point comes, but with prior practice, it is totally possible. It is also possible to do a 50/50 spread draw from that position. Perhaps all a deer sees is a lump on the the tree and it helps if that tree has a buddy or two, but lean away from the tree, the deer will see the back grounds change and be alerted. Iowa deer are masters at motion detection, one can go as slow as he can in the draw and a deer can pick up the smallest waggle of a bow or the turning of of the body or head. There are certainly no guarantees, but it is a big help with shot timing issues. For example, if it takes one 5 seconds to get off a shot, but a deer's head is either turned or behind a tree for two seconds. Many will say that is not a shooting opportunity, but as Schulz demonstrated the slower shots are one second tempo shots, a two second opportunity is a shooting opportunity with that tempo.