always set your OA to brake, not bypass
But if you set it to brake won't it just sit there waiting till either you regain connection and continue to fly (which it can't do or it would have never lost connection in the first place) or wait for the obstacle to move (again obviously not going to happen)? So it would just there until the battery dies and you will still end up with a crash and a lost drone since it's that being on the side of a mountain you likely won't have access to retrieve it.
I think I'll just take my chances with bypass mode and hopefully it'll be smart enough to not crash. At least with that I have a chance to get it back.