I’m a little late to this conversation, but better late than never.
It’s really tough to assign blame for damage sometimes. The sub just shows up and not a bunch of time for planning and making sure the right equipment is on the job. The ability to walk is a key to this. The Forman/salesman bid the job and probably had an idea of how it was going to go down.
A recent job we did come to mind that clarifies my point. Dead maple along drive, leaning ever so slightly down hill and back. We obviously want to go cross hill against the lean (at time of estimate).
Show up on the job and I had miss identified the tree because I had been talking to the HO. It was a dead hickory. We get a rope set. Plan is to pull by hand across slope against the back lean. Notch is cut (wood doesn’t look happy) but the sub and I agree to continue. Back cut is made, well before the hinge is set the tree breaks off approximately 90 degrees from our fall direction and goes crashing down the hill. I did all I could do on the rope, it even took the grippy off my gloves. Luckily no damage, but it could have been realllllly bad. My plan my fault, sure he cut it. But I miss identified it, didn’t change the work plan when we knew, and allowed it to happen on my clients property.
Another project sub is climbing a tulip poplar. Rigging wood out. “Ok I can drop chunks”. First one comes off and lands smack on a nearby fence.... his plan, his fault. It’s really dependent on the situation.