On Archeopteryx, running theropods, and arboreal origins

I've been wondering for some time now about a piece of evidence that could help resolve the ground up/trees down argument (I realize no one piece of evidence will be enough, but this seems significant). I've heard many trees down supporters site Archeopteryx's foot, apparently adapted to arboreal enviomrents, as evidence that Archy evolved from the trees. However, I've been wondering about the biomechanics involved. Without an allula, could Archy even land on a branch as modern birds do? Or would he have to hit the ground running? Also, could archy's foot be explained as, say, an adaptation to attacking prey with its foot rather than it's akward forearms?

I always thought that the 'trees down' explanation seemed more plausible...but for predatory reasons. The birds would climb the tree, lie in wait for small lizards, large insects, rodent-like protomammals, etc. to wander by. The Arky would then swoop down from the branch/limb, land on top of the animal and snap its neck....(this would explain why the teeth have not specialized as the small, uniform, unspecialized teeth would be better for grip, so that with one swift motion of its head it could break a small animals' neck)...then it would drag its prey back up into the tree (using its feet and hands), where it would consume the animal, and then remain perched on a branch like a song bird, and wait for its next meal.

...and so the debate continues...