Sorry for your loss and glad you were there for your brother.Sadly, no. It was the same thing that happened to my brother in his late 20's. Decided to climb an extension ladder to take out a large, high limb. Limb swung down and took out him and the ladder.
In my brother's case, his wife was terrified and called me over before the cutting. I convinced him to rig a safety line and tie a basket harness (we learned from rappelling). I held the ladder and he cut the limb. As I had feared, the limb swung down and smashed into the ladder. Knocked him off and pinched both my pinkies to the ladder as it buckled. Safety line held though and I lowered him down. Everybody more or less ok.
Fast forward 25 years later to my buddy. He was not so lucky and did not have anyone belaying him. He died later that night. I do what I can now for his wife and kids. RIP Marine.