Its nount to do with Post numbers.
And to be honest if I have got something wrong please tell me as I will add it to my store of info.
Beta to me is not only a blade angle but it also means that there is a transfer from the fuel controller to the prop pitch controller which then controls the fuel input. The beta tube moves a fair bit and the fuel controller controls the blade pitch and the prop pitch controller maintains the rpm. It produces a very marked decleration, the plane would have dropped like a brick.
The angles were never recorded they were assumed from the fuel flow.
I haven't flow the type but on my type with similar engines if the plane thinks its in the air and you move into beta there is an alarm triggered which you can hear from outside the aircraft. I don't know if the metro has such a warning but you would definately have heard it on the CVR on my type.
also to note
There is no mention of engine RPM in the report it could be that the overspeed gov had reduced the fuel flow.