Jim, Maybe I dont' understand how the Leki thing wokrs but if you are clicked in? and you hold the pole up and let go, does the pole remain in the plam of your hand or does it drop down free of the hand? If it stays in the palm of yor hand, it will act like a lever and fulcrum, if you fall and land with your hand open, it will just pop the thumb as it gets trapped between you and ground. Is that the case with the Leki?
Let's see.? Here's what it is, tell me what you think.? There is a strap around the hand/glove about the width of a normal pole strap, velcro closure. There is a thinner piece of elastic running between the thumb and forefinger and attached to the strap.? This elastic carries the attachment to the pole.? The attachment point on the pole is at the very top, so when you are clipped in and holding the pole the elastic stretches a bit because your hand is lower on the grip. When you let go, the elastic stretches a little bit and the pole drops a few inches. So the pole is still in the vicinity of the hand, but no longer really between the forefinger and the thumb. What happens when you fall would probably be dependant on gravity and momentum, but it's not going to fall out of the way as much as a pole on a strap (or as a pole without a strap).
The one fall I described, the pole planted itseld as I was falling, and the elastic part just ripped off (no impact on the hand at all).? If you fell with your hands out in front of you, the pole might still be under the lower part of the palm, but probably not in the normal thumb/forefinger slot.? I like Gary's assessment, s__t happens.? I do like the Leki's as a sort of compromise between strap and strapless.
BTW, the Leki's also come with a normal strap to fits into the trigger. More flexibility
OK, I am clear now, I thought that it just clipped in over the top of the gap between your thumb and index finger, Sounds cool. I think phil uses that as well.