I think that this needs the temperament of whether a conflict is warranted for ‘get away’ from a dangerous scenario where the opposition has a goal to kill.
Consider that Mouse Nature includes escaping, hiding and all but weasels or other mice will be rolling only Nature or Season rating for all actions of the conflict. If the typical conflict is scavenger, predator, raptor, serpent stalking or hunting a mouse patrol with intent to kill and eat, then I don’t see a need for a Conflict scene unless the players turn to confront (fight) the animal.
In fact, it is far easier for the patrol to run away with a single test of Mouse Nature with Helpers from the patrol mates, and possibly tapped Nature from Persona. That’s a hefty bit of dice to throw at the intent to get away from an animal. I’d say that’s the first step if the table chatter indicates the patrol wants to get away. After those dice are thrown, then assess what happens in the Vs results.
In the case of an animal, Mouse Nature Vs animal Nature, let’s presume the table chatter indicates, “We are going to get away from this threat!” When the mice are successful, they escape and hide. When the animal is successful, the GM can offer Success w/ Condition or Twist. Success w/ Condition still leads to, “The patrol of mice escapes and hides.” A Twist could be a different hazard (probably not another Animal), yet it could allow a GM to say, “everything gets worse.” And, in that step, you might insist the patrol has attempted to get away, but that didn’t work; the beast continued or curtailed your effort. And that should lead to more table chatter, but I’d say it does not allow for a second attempt of, “We are going to get away from this threat!”
So, in that case, the desire to escape and/or hide should lead to a Vs test rather than Chase Conflict. Yet even in a Chase conflict, the animal rolls Nature for all actions while the mice roll Pathfinder and Scout alongside Nature for their actions; those make good sense for being the object of a chase. They want to find a good route and keep an eye on the opposition’s movements.
In the case of weasels or other mice confronting the patrol, I’d say the table chatter should still allow for, “We are going to get away from this threat!” by way of Nature Vs …
The results can follow the same course as the animal pursuit.
In the case of a weather or wilderness threat that has intent to kill, I do think the patrol can attempt to get away, but perhaps in some cases the GM may curtail that saying, “this is too wide spread for just getting away; you need to confront this in a different manner.”
So, overall, I see the first step is always offer the patrol a chance to get away by a single Vs test. Only if the patrol, through table chatter, describes confronting the opposition should a Fight or Fight Animal Conflict be used. In those cases, the idea of defeating the opposition by getting away ought to be avoided by the players. They’ve indicated the terms of confrontation, so they have to confront and deal, not call it a fight, but try to run off. Otherwise, they can still use Maneuvers during the fight that may involve backtracking, sidestepping, and otherwise moving away from the confrontation–only in the Compromise can they negotiate getting away from the fight.
But, Chase Conflict is a really great spot for the players to induce a pursuit of animal(s), weasel(s), or other mouse(mice). It’s a great tool for the patrol to be on the pursuit rather than be the object of pursuit. In those cases, I’d allow they can pursue another mouse or other mice; as GM, I’d have those characters using Mouse Nature to attempt to get away only in the scope of not having Pathfinder or Scout for the actions of the Conflict.
Ultimately, if the players are telling you, “We want to get away from this confrontation rather than face it,” use a single Nature Vs test to narrate the results and go on to use the hazard unmitigated; the patrol has done nothing to mitigate the issue. Their story drive another direction. Take them in that direction instead. That’s why they get to dictate the terms of the scene. They are given a special tool: Mouse Nature (escaping, hiding, climbing, foraging). If that’s the task and intent, they get to call upon that tool; and the GM should focus instead on a single Vs test.
Now, as for the difference between Get Away and Kill Prey, this presents a different conversation and a different tool given to players by the mechanics. So, that’s for another thread.