This has some good old time stuff that still applies today. Check about 14:25 for a big snag shedding it's bark. I've seen that happen and if you're double jacking get it clear with your partner which way you're both going to run. That way you don't run into each other, fall down, and wind up wearing the tree.
had to rewatch that, didn't see it the first time... thats some crazy stuff.
and the whole core of the tree was mush too... whole lotta ick