Teleport and combat time.

[Kromm]

Activating an advantage is a single maneuver, either Ready or Concentrate in most cases; casting a one-second spell is always a Concentrate maneuver. In either case, the effect occurs at the very end of the "active" part of your turn, immediately before the next person in the combat sequence acts. Thus, only someone else with a Wait maneuver can interrupt it.

Concrete example: The combat sequence is ABCD; I am A. On my turn, I take a Concentrate maneuver to cast the Teleport spell. Unless B, C, or D took a Wait on her last turn, none of them can interrupt this. I roll the dice for the spell and hopefully teleport. Then it is B's turn to do something, and so on down the line.