hi, i am trying to build a hand now follow the tutorial
one thing that make me feel really funny is , why the developer make it so hard to use the Split Polygon Tool?

since we are in polygon proxy mode, and we try to split it in "front view (according to tutorial)" but when we click on the top edge of the proxy mode "box", sometime, the software understand me correctly, it knew i want to click on the front top edge, but sometime, it put my click at the back top edge?..

ok, is there any trick or tip in such situation?