It's not the best drawing, but the angle is almost impossible to hit from the "birdie zone". Those brown stars are all trees, many of which are over 100 ft high. The star on the top of the hill is about a 40 ft tree that really pinches the angle. You'd have to throw a shot high enough to clear the hill and the tree and then turn almost 90 degrees. If it fades out, you're in the wetlands, if it turns over, you're in the wetlands. Usually from the birdie landing zone the best shot is a soft turnover to the top of the hill just under the tree, or a big forehand stall shot over the tree and then crashing to the 175 ft landing zone.
The Eagle landing zone is really just opening up the angle. Now with two great long shots it is possible to hit the green. Does that make more sense now?