How to - ice screw placement, kids in the outdoors

At what angle do you place a ice screw? http://youtube.com/mgbanach makes the bold statement that you always place a ice screw at a positive angle. (Downward so that the hanger is tilted in the angle of pull/load.) This was a comment make on the http://youtube.com/mikebarter387 site. Mike however is not really so sure that you can make a definitive statement like this and that perhaps ice quality may come into play also.

Kid and the outdoors. http://youtube.com/domu888 Domu has a 2.5 year old kid who he wants to introduce to the outdoors. I have a unit the exact same age so I can relate to his situation.