It wasn't a word it was a sound......So how do you put it into words? at 14.30 VIDEO
Well from KM's description in the video you have linked it is quite clear.
She saw the door to the children's room was quite far open pulled the door to, seemingly without looking inside the room, and the door slammed shut.
She opened the door again saw M was not there so she went to her[Kate's room] and M was not there either.
She returned to M's room where she observed the curtains that had been closed whooshed [billowed?] open. The window was open and the shutter raised; her gesture indicates the curtains billowed into the room.
Straightforward enough.
The door would slam shut and the curtains billow[my word] by movement of air. The only thing to remember about movement of air is that it always moves from high pressure areas to low pressure areas. So when the door closed and the curtains billowed the HP side was outside the building. Does it do us any good having that knowledge? Maybe not.
How does the statement in the video stack up against statements given to the police? Are there any glaring discrepancies?
But if the curtains were closed as is suggested in the video it makes the abduction through the window theory very interesting.