Freeleech has 1 important bit, that most people forget.
All freelech has a set time limit.
As an example; if I set a torrent to freeleech for 94 hours, it stops being freelech when that time is over. It doesn't matter when you get the torrent file, if you have not finished downloading the video when the time is up, it will start counting against you from that point.
Any part of the video that you got while it's freeleech is "free" while any remaining part will count against you.