I say, and with God's success: The prayer of fear is that part of the followers prays the first rak'ah with the imam, while part remains facing the enemy. If they complete the first rak'ah, they go to face the enemy, and the second group comes and prays the second rak'ah with the imam, then they go to face the enemy, and the first group returns and completes the prayer later, then they go to face the enemy, and the second group prays the first rak'ah that they missed individually. And God knows best.