What do you mean by "relieving tension as you go"
If you look down the length of a blown-down tree, you will often see that it has wedged itself between several other trees on its way down. This means that in addition to any top or bottom bind it may have as a result of its lay, it will have often multiple side binds, as well. If you just take a big whack out of the log where you want the hole for the trail to be, it can be nearly impossible to judge where the log will go when it has binds on several axes at once. It's best, then, to cut the side binds free one by one, working from small end to big end, so that when you cut the trail clear, the log doesn't bite you. I missed one bind once and the log swung on me. It pushed me down firmly but gently, like a stern teacher. I was uninjured, but I learned the lesson.
Please expand/explain. Perhaps an example.
If you have a heavy top or bottom bind (such as a log hanging out over empty space, or hung between berms on opposite sides of a road) and you just cut from the side opposite the bind, the tension will often cause the wood on the far site to separate prematurely. It's hard to judge where the log will end up when this happens. Far better to have relieving cuts in there first so it breaks cleanly and predictably.
Like splits? I've noticed in blocking dead fall, the saw behaves very erratic in areas where the log is fractured.
Splits, rots, anything. Wood is dynamic stuff; be heads-up about its potential to hurt you.
Now, regarding the matter of poor manners: I intend to educate not only MtnHermit here, but also anybody else who comes here looking for answers. I would be doing all a disservice by refusing to answer these questions when someone could get hurt for lack of guidance. This is a "new" guy who may not know the Rules Of The Road here, and gets the same chance to sink or swim that anybody does, and the questions are pertinent to pretty much all of us.