NIST states that WTC7 went into freefall 1.75 seconds after its colapse started.

Fact, WTC7 final report pg45 or pg87 on a PDF viewer. Fact, free fall is verifiable through observation. Fact, disagree, then you now disbelieve the official government authority, NIST.. Fact, unfortunately all the lovely proof through CGI & physics engines cannot be proven fact or disproved, because they haven't been released due to 'public safety'.
Fact, get the report here: