Both Zork and Sessativa spot a person following you. The one Zork sees is to the east and wearing a muted green cloak. Appears to be very knowledge of the woods. The one Sessativa spots is following you and moves quickly. She would think that person is of elven decent.
Sessativa and Durgan stop near Zork and she informs them of what she saw. He casts Aid on Zork, while she makes sure everything is in her pack, casts Invisibility on herself and dismounts, standing wherever is a good vantage point for sight.
Out of Character: Not sure which dice for hiding when invisible, rolled a bunch.
Don't forget Zork's temporary HP and +1 to attack and to saves against fear.
Zork heads back to Durgan and says, "Let's move forward and let your partner hang back and see if they still follow. She can always signal to us if we move slower."
Durgan will take the reigns of Sessativa's horse and lead it.
Sessativa will pick a nearby vantage point and stand there to avoid making noise. Not only does she look ahead, but also glances back waiting for the moment Durgan and Zork are just out of sight.
Out of Character: The spell says it has a special duration. It should remain in effect until magically broken or dispelled, cancelled, or I attack.
If you go by other editions, then 1 minute per level.
Just wondering about Teleporting - if she's trying to observe the forest near the others, does that count as 'seen casually' or 'viewed once' for mishap purposes?