I greatly enjoyed my tutorial game, but I'm not sure if we played it right in the end.

To advance through act 2, you must collectively spend your clues at the end of the round in the hallway.

Act 2b says to spawn the set aside Ghoul Priest in the Hallway.

The Ghoul Priest has a Prey of the investigator with the highest fight (which was me as Roland Banks).

We played it as the Ghoul Priest was not engaged at the beginning of the round, and then I attacked him so he'd go to me and stay attacking me (until I almost died). I think I used the un-engaged time to get some resources and get out the guard dog, though.

Was this the correct interpretation? Or should I have had him enter play engaged going into the mythos phase?

Enemies (that are not aloof) automatically engages as long as they are unexhausted. So as soon as the ghoul priest appears he will try to engage with someone.

D'oh! Missed that, but that seems much more reasonable!

I also had this question and now it is clear that Ghoul Priest engages Roland in the moment it spawns, in a Roland-Wendy party. But if Wendy wants to evade (exhaust) it, she should use an action to engage it and another action to try evade it... is that correct? Now, that it is exhausted, Roland could attack it and it can't retaliate.

I also had this question and now it is clear that Ghoul Priest engages Roland in the moment it spawns, in a Roland-Wendy party. But if Wendy wants to evade (exhaust) it, she should use an action to engage it and another action to try evade it... is that correct? Now, that it is exhausted, Roland could attack it and it can't retaliate.

Correct.