the wizard specialist ability from PHB2...
-- Abrupt Jaunt (conjuration): You teleport up to 10 feet.
-- Activating this ability is an immediate action...
-- You can’t activate this ability in response to an attack that you aren’t aware of.
and this tidbit on the introduction of immediate actions could be added to provide a little context ...
You also cannot use an immediate action if you are currently flat-footed.
I am trying to avoid excessive RAW, as my DM is already a bit weary of the ability being abused. I think the RAW is slightly misleading because most of the different abilities have specific triggers, or have lasting effects, whereas the abrupt jaunt is instantaneous and seems castable with godlike precision. The primary concern from my DM is when I want to jaunt in response to some event (both in combat and out).
Example might be when an archer wants to shoot an arrow at me.
If I jaunt in response to him targetting me, that might mean he has not actually shot yet, and could re-target me at my new location (perhaps with a penalty on attack roll)
If I jaunt in response to him actually shooting the arrow (meaning release of the bow-string, or the moment after he has completed targetting), does my character actually succeed in activation in time (argument being that although jaunt is immediate, a flying arrow is also moving very quickly, so which occurs first)
Another example I came across in some forum argument: using jaunt while falling, in order to avoid any damage from the fall.
Assume a fall from 100ft, and using real-world physics from earth
If you jaunt too soon, then you are still in a falling position (and could still take damage, even if reduced damage, still damage none-the-less). Jaunt too late, and you hit before the teleport.
Ideally, you might want to jaunt in the last 10ft of the fall, but at that moment in time, you are moving roughly 60mph, and you will pass through the "10ft window of opportunity" in roughly 1/10 of a second. I know immediate actions are fast, but 1/10 of a second is pretty fast as well.
What are some reasonable interpretations on how to deal with these split-second triggers/timings?
We seem to have come up with a decent solution where I need to roll a Reflex save in order to teleport as intended (otherwise we assume the teleport fails or executes with non-optimal outcome).
Does our solution get close to the spirit of things? Should we do a concentration check instead? Should it be a near "godlike" activation when you are fully aware and fully focused on the single task at hand?