I think for the sake of trying something different, I might just apply the rule from pushing into a pit (rolling to hit again) and on a miss the target is teleported on the ground level instead. Maybe the avenger still get teleported high up in the air and then fall just for risk/reward sake. I can always adjust it later if it is still too strong, but I don't want to say no directly to a creative use of a power.
Anyway, I'm pretty sure the player of that particular avenger will never think of that use for that power, unless I pull the same thing of with a monster before their very eyes.
Anyway, I'm pretty sure the player of that particular avenger will never think of that use for that power, unless I pull the same thing of with a monster before their very eyes.