Watson saw Barrymore signalling the light through the window

[angelene001]

I have a problem with expanding it into a full sentence:
Watson/see/Barrymore/signal/light/window.

It's from 'The hound of the Baskervilles". The man standing at the window with the light (a lamp or a candle).

Is this correct:
1.Watson saw Barrymore signalling the light through the window.
Or maybe:
2. Watson saw Barrymore giving the signal with the light through the window.

'Through', 'across' or 'at' - which preposition is better here?

 

[bhaisahab]

I'd use "Watson saw Barrymore signalling with the light from the window".

 

[Rover_KE]

I have a problem with expanding it into a full sentence:
Watson/see/Barrymore/signal/light/window.

Who asked you to do this exercise, angelene?

 

[Tdol]

I'd use "Watson saw Barrymore signalling with the light from the window".

I would use this or at.

 

[angelene001]

Who asked you to do this exercise, angelene?

It's from the course book. First there is a story in the form of comic. And then this exercise.

When I see your answers it seems so obvious
But when I've tried by myself first, you can see what I've come up with