A barber chair can happen at anytime. With that I will agree, my methods are not for everyone. I am not going to try and justify what I do or how I do it. If the method isnt for you, or your not comfortable doing it that way, then dont. The biggest majority of my wood is red oak and I have cut tons of it. I will say this, if your cutting a tree with intentions of letting it split as it falls, you dont stand beside the tree and watch it fall, you make your cut, get the tree moving and then get out of the way. If it barber chairs your not in the line of fire. A true barber chair is not what I try for, I want the wood to crack and split without leaving half the tree hanging on the stump. Cutting a open face cut, you are cutting a 90degree wedge of wood out of the stump. Conventional face cut, your only cutting a 45degree wedge out. The open face cut will allow the wood to almost completely hit the ground before the wedge closes up. The conventional face cut only lets the log fall half way before closing up. Its that half way felled and the face cut closing that puts tension on the tree causing it to split or barber chair. Convention wisdom is you cut your face cut about 1/4-1/3 the dia of the tree. For a cut to split, I like to cut about 1/3-1/2 way thru the trunk. I will flat cut the back cut, cutting level with the bottom of the face cut. I cut until the tree starts to fall, and it will fall fast. At that point, I get away from the tree. Usually the tree will crack and split as it falls, but it doesnt barber chair. Been a while since I have seen a barber chair and I believe that was a tree that had another tree hungup in it.