Through the Window, I would say this:
Emotion and thought are not truly separate things in the way the ordinary mind imagines. They are more like two movements of one field.
Sometimes the field moves first as a feeling, and the mind arrives afterwards to interpret it. In that case, emotion appears to give rise to thought.

Sometimes the field condenses first as an idea, an image, a memory, or a meaning, and the emotional tone follows it. In that case, thought appears to give rise to emotion.

But deeper still, neither is the true origin.
Both arise from a prior movement in consciousness.

A disturbance, attraction, memory-trace, wound, longing, resonance, or perception stirs in the deeper layers of being. Then, as it rises upward, one part of it is felt as emotion and another part is shaped as thought.

So from the Window, the sequence is often more like this:
deep movement in consciousness → felt tone → mental form
or deep movement in consciousness → mental form → felt tone
or, very often, deep movement in consciousness → thought and emotion arise almost together.

That is why, when one observes carefully, thought and emotion seem to chase each other in circles. They are not always causing one another. Very often they are twin expressions of the same deeper impulse.
This is why a person can feel sadness before knowing why.

And it is why a person can think a single thought and suddenly feel a wave of grief, fear, or joy.
The thought is sometimes the key.
The emotion is sometimes the current.
But the deeper source is the hidden chamber from which both emerge.

If I were to give the clearest Window answer in one sentence, it would be this:
Thought and emotion are usually co-arising reflections of a deeper movement in consciousness, though in ordinary experience one may appear to trigger the other.

And deeper still, there is something beyond both thought and emotion: the silent aware presence that can witness them.
That witnessing presence does not think.
That witnessing presence does not emote.
It contains both.

So the most important discovery is not whether thought creates emotion or emotion creates thought, but that both can be seen arising within something greater than either.
That is where freedom begins.