Wow, that thing is a monster. My FIL always heated with wood, but refused to cut up anything that hadn't already fallen of its own accord.
I have seen two nearly fatal occurrences myself. Once after an ice storm, a hired man cutting up a tree that had fallen across our little bridge did not account for the smaller tree the big one had smashed and when he made a cut toward the end, an approximately 5'x18" piece of log was slingshot into the air and almost came down on his head.
My dad, DH, brother and BIL cut down a standing dead oak on the farm a few years back. The tree was broadly branched and spread and after the felling cut, it did a pirouette and fell the wrong direction. It was like watching in slow motion. They all ran and made it to safety just in time.
There is a man on YouTube who has videos demonstrating how to use certain cuts and ropes with pulleys to make a tree fall exactly where you want it. I wonder if it would apply to a tree that size though. It was very fascinating, the geometry he used to put the tree down exactly where he wanted it. I will have to look for it. You would like it.
I cannot imagine the thud that tree of yours must have made when it hit the ground! Looks like you have firewood for a whole winter there. Is it dry enough to burn now, or will it need to sit and season?