I am trying to build a killing spot for endermen. The idea is that I'm safe for their attack because I stand on a place that is only 2 high and they cannot get to me. I wait there and challenge them to come with a staring contest. This place is build on a small hill with an overhanging edge to stop spiders and other mobs from party crashing. A vertical cut would look something like this, with 'X' a solid block, '_' some air, 'p' the player and 'e' an enderman:
X X X
X p
X p
X X X X X X X X e
X X X X X X X _ e
X X X X X X X _ e
X X X X X X X X X X X X X X X X X X X X X X
The problem is that it looks like the endermen refuse to teleport next to me and get their selves killed. Could there be some rule that they cannot teleport up the hill because it has an overhanging edge?