i've had the bar pinch enough to do the lower cut first if anything of size /felling , that is slanted if Humboldt or Open Face.
Especially in most used conventional, have done a 'chalk line' bottom cut with saw especially if irregular shaping, perhaps all the way around, at least front
>>then run slanted cut down to chalk line, then cut chalk line
Actually started that by using actual chalk line while working construction area on hill and chalk line was sitting right there trying to get my attention.
.
If nip sides anyways to not get leathery bark strip pull to side, gonna cut all the way around anyways.
>>If cut full circumference, lining up pure straight cuts from bar should meet square or near enough to adjust and throw.