There is no excuse for anything to fall into his yard. 1. He owns the airspace over his yard all the way to the edge of space. It is a trespass. 2. It is very dangerous to have his property bombarded by falling objects. I would call OSHA and let them take on harassing the contractor.
If there is any damage to his tree where the beam hit it he has proof that they screwed up big time. Again, OSHA is his friend. They could have to write a new safety plan 5000 pages long for that one.
He will be able to collect big from the airlines then, eh?
If they damaged his tree, then yes, they are responsible for the damage.
Citizens don’t own much in this country any longer. Skip paying your taxes or if the government decides they need your land *poof* gone.