Change Size ruling
After some consideration, I am going with my original view on the Change Size spell and restrict it to targeting creatures. Even with that limitation, it is already a powerful and flexible spell both in and out of combat, keeping it roughly on par with the scope of other spells.
Retroactively, we can say that the spell was never cast; it didn't have much effect on the outcome in any case. Whoever cast Change Size this session (presumably Þorgrim?) can retroactively regain the 1 Resolve they spent on casting it.