And before you go on saying that the wizards teleport away when you arrive...well, Argoniel did not. Here is what I did: 1) Movement infusion when I saw the two wizards. 2) Move one tile while moving fast. 3) Use Stone wall to trap Elandar (this was my grand scheme from the beginning, to stop him from getting away). 4) Start blasting Argoniel. 5) She becomes hostile and the "reached destination in time" event does not happen. My time counter is still running towards zero.
So, what't the problem you ask? My archmage is certainly strong enough to take her out. Well, the problem is, that she is - invincible and doesn't take any damage at all

.
Sooo, help pleaze. What do I do now? Recall? Let the timer run to zero?
EDIT. Also, if I'm not completely mistaken, Argoniel now has Elandar's spellset with Essence of Speed and the like active.
EDIT 2. Elandar didn't teleport away either. He has the same spellset as Argoniel.