Felling a 75-80' oak tree

Unfortunately, we had to take down this majestic oak tree due to rot and weakness that was the result of it having grown with two trunks. The first half of the tree fell on a clear day a couple of weeks ago. After reviewing the remaining (split open) trunk, it was decided to take down the other half in a (relatively) controlled manner, rather than have it fall who-knows-which-way in a next storm.
This is the tallest tree I have felled. Fortunately, I had great advice and guidance from a friend who spent many years working in tree services!