As editor with many years experience I am well aware of the need to edit for time and the tricks of trade used to achieve it.
I also know how effectively edits can misrepresent the truth.
If the only time he supposedly experienced collapse-caused shaking was when Mr. Hess was still on the 6th floor than Mr. Hess's later remarks would have made that clear.
The questionable edit, which took Mr. Hess from the 6th floor stairwell to the 8th floor office, picks up with Mr. Hess talking about calming down after building shaking, and that maybe it was a basement explosion, which appeared to have occurred .
With the interviewer injecting a query about what Mr. Hess heard at that stage, Mr. Hess continues on responding that he heard a tremendous wind and the sound of sirens.."and I look out the window...."
My problem when listening to Mr. Hess is that at no point does he contextually separate his second reference to the building shaking and a possible basement explosion, from rest of what he describes on the 8th floor.
When listening and watching the interview, to me, it sounds like he was describing another building shaking occurrence while on the 8th floor that was followed by his observation of blowing wind, sirens and what he saw from the broken window.