I am not saying I know what broke that tree. I'm saying I don't know. So far, that is the most any of us here can say. The reporter of the event has some credibility with me, and my working assumption is it happened as it was related. The fallibility of sense impression can never be discounted, but the nature of the event seems to make that a small possibility.
I think the inability to just say, "I don't know.....but I'm continuing to be open to possible answers" causes more dissent and lack of understanding than just about anything around here. Saying you "know" a BF did not do it, when you are equally unable to say with any reasonable certainty what did do it, is not an approach that is ever likely to produce answers and is the exact antithesis of considered inquiry, IMHO, and as ill-advised as saying you "know" an unlisted, unconfirmed species did it. Different sides of the same coin. The coin has three sides though, and always has.
Over and over we fall into the trap of the false binary analysis here. Bipto is a guy, and his organization mirrors this as far as I can tell, who understands that just holding out the question until you have proof-positive, is the smart choice. Individual experiences count, but they are not going to hold out the answers for the vast majority of us. This is the way science should be done.
His experiences, and all the other experiences we read about, just pose a single question that must be addressed: What is it? For ever instance, like this one here, when you fail to rise to that challenge, you are not moving the ball, and in fact, you are working the opposite.
So we have lots of theories about how this could not be this and that. I don't think it could be a meteorite strike either, so let's throw that on the pile. So what?