Let's have a close look at what Matt says.

[Robittybob1]

Are Matthew's and Rachel's statements that odd?
They could be a bit odd.  What do you find odd about them?

[Alice Purjorick]

Of course you are going to get some air movement but nothing large enough to blow a door open.

Would you care to back that up with some calculation ? .
I repeat : natural air flow is caused by changes in temperature and pressure. If you think it is caused by something else enlighten us do.

[Robittybob1]

Would you care to back that up with some calculation ? .
I repeat : natural air flow is caused by changes in temperature and pressure. If you think it is caused by something else enlighten us do.

I would love to show you scientifically but we'd need to do the experiment in G5A and see if we can make the kid's bedroom door move.  My previous role had a certain amount of emphasis on air movement around rooms so I'd say I know quite a bit about the subject in a practical sense.
Air flow could also be caused by fans.  I don't know if the word natural is the right one for we are discussing the movement of air in a building (a man-made structure) so you have orientation, design, windows,  doors, ventilation ducts and fans to consider as well as temperature and pressure.

[sadie]

I have experienced the slamming door effect Kate is talking about.  It doesn't require a strong air flow.  In fact when the door is open it won't slam shut but the air has to be able to go somewhere so not only would the window in the kid's bedroom be open but there would have to something else open as well.  The air has to be able to go through the building.  Was there any other window open?  If not I'd say she did her check with the sliding door open too implying she was intending to go back to the Tapas Bar.

I wondered if
One of the windows in the sitting room was open?

Or just possibly the patio door to the parents bedroom was slightly open ?

Cos Kate believes that she checked the sitting room patio door and that was closed.

[Alice Purjorick]

I would love to show you scientifically but we'd need to do the experiment in G5A and see if we can make the kid's bedroom door move.  My previous role had a certain amount of emphasis on air movement around rooms so I'd say I know quite a bit about the subject in a practical sense.
Air flow could also be caused by fans.  I don't know if the word natural is the right one for we are discussing the movement of air in a building (a man-made structure) so you have orientation, design, windows,  doors, ventilation ducts and fans to consider as well as temperature and pressure.

Jolly good. You should find it easy then.
I used the term "natural" to differentiate from I.D.

[Robittybob1]

Jolly good. You should find it easy then.
I used the term "natural" to differentiate from I.D.

What are you on about now "I.D."?  Does that = man made design?   There is no point in doing the experiment anywhere else is there?

[Alice Purjorick]

What are you on about now "I.D."?  Does that = man made design?   There is no point in doing the experiment anywhere else is there?

You said you knew about air movement I.D is a common term in that field to indicate that which is not natural.
It would be easy to do a roughing in calculation without leaving one's armchair. Just to see if the proposition was a goer, like

[Robittybob1]

You said you knew about air movement I.D is a common term in that field to indicate that which is not natural.
It would be easy to do a roughing in calculation without leaving one's armchair. Just to see if the proposition was a goer, like

Not for me it wouldn't.  I wouldn't know where to start on a calculation like that.

@Alice - What do you think the I.D. stands for?

[Robittybob1]

If Matthew Oldfield did peek around the corner and he didn't see Madeleine at all, would he have raised the alarm?

Why is no one offering an answer to this question?  If Matthew Oldfield had peeked around the corner and he didn't see Madeleine at all, would he have raised the alarm?

[jassi]

Perhaps because there is no answer.
The question I would ask is why he did not look around the corner?
He had gone there with the specific intent on checking on the children so why didn't he eyeball them all?

[Benice]

Perhaps because there is no answer.
The question I would ask is why he did not look around the corner?
He had gone there with the specific intent on checking on the children so why didn't he eyeball them all?

Because he was listening out for any sounds that meant they were not asleep and not checking to see if all the children were still there?    All being quiet he assumed they were all asleep and so all was well.

It's not uncommon for parents to listen from outside the bedroom door at times - without actually opening it IMO.

[Robittybob1]

Because he was listening out for any sounds that meant they were not asleep and not checking to see if all the children were still there?    All being quiet he assumed they were all asleep and so all was well.

It's not uncommon for parents to listen from outside the bedroom door at times - without actually opening it IMO.

He could hear the twins breathing, well what about Madeleine does she not breath?

[slartibartfast]

Because he was listening out for any sounds that meant they were not asleep and not checking to see if all the children were still there?    All being quiet he assumed they were all asleep and so all was well.

It's not uncommon for parents to listen from outside the bedroom door at times - without actually opening it IMO.

Totally agree, I wonder how many of the checks were listen only.

[Robittybob1]

Totally agree, I wonder how many of the checks were listen only.

But doesn't he specifically say he could hear the twins breathing so you'd think you would hear the third person as well.

[jassi]

Totally agree, I wonder how many of the checks were listen only.

Clearly, Gerry wasn't happy about listening only.
Not only did he go to his apartment immediately after Matt had done is listening act at the window, but he actually set eyes on his children.