In the lesson "Don't cry over spilled milk" there is the follwing sentence:

先生がおこってしまいました。

When I use the "regretter" meaning of ~てしまいました  to translate  this sentence it would mean something like:

The teacher got angry (which I regret).

But when I use the "terminator" meaning of ~てしまいました it could also be translated as:

The teacher finished being agry.

The first translation seems more likely but the second also seems a plausible translation.

So now, finally, comes my question: Does the meaning of this sentence depend on the context of the story in which it is told or did I miss something?