If anyone could clarify this for me, it'd be appreciated.
I can't recall specifically which investigator I was playing, but I drew an other-world encounter in which "a monster appears!" From the cup appeared a dark young. At the time it spawned I had approximately 4 sanity, and 4 stamina. I sized up the fight, and I don't think evading was an option (it had a -2 to the check, and my sneak happened to be 2). Based on this I chose to fight. I passed my horror check, and had no issue with the nightmarish. It was about this time that I noticed the physical resistance, and despite a heck of a lot of bonuses, I still managed to botch the roll and not get the 3 successes needed.
I understand that because I didn't get the 3 toughness in one shot, I 'lost' that round of combat and take 3 stamina loss. However, because the monster spawned as a result of an encounter card and no gate came with it, at which point does it return to the cup?
Or put another way: my investigator was not knocked unconscious, nor was the monster defeated after it appeared. Does the monster return to the cup in this instance after I take my 3 stamina, or does it remain until I either a) evade it, b) defeat it, or c) it defeats me.