If Shatner does not die, then it is more like a half-round of delay, because he will be teleported out as soon as it is his turn and it is determined he can't take any actions.
If Shatner does die and Danuba does not specify the MEA now, the dispel takes place immediately, the new combatant enters, and Danube loses the MEA. She cannot react to the results of the breath that quickly before the new combatant enters.