interesting tree, I have a burl on my oak, they said if I chop off the burl it will die. it is tempting
Unless the burl goes all the way through, I'd have to call this one. After all, if it goes all the way through and you cut it...yes, the tree will die. If it is hanging off the side and you cut it, the tree will try to scar the cut(if you paint the cut to reduce ants and moisture) and it will probably be just fine!
I've taken a few burls off the side of trees, and they are doing just fine(and the burls too)
Scott (cut it and once on the ground utilize it) B