Think ahead before you begin to cross-cut, especially if it is a large trunk. Where will the next length fall when you cut through it? And what will happen to the rest of the tree when you cut off a large, heavy length?
Start by gripping the front handle with your left thumb and apply full throttle before you begin to cut. Stand diagonally behind the saw while you work, not directly behind it.
If the trunk is supported at both ends
If you try to cut the trunk from above when it is supported at both ends, the cut will close up and trap the saw. This is why you must always cut the trunk from below. First make a shallow cut in the top of the trunk above the cutting point to prevent the trunk from splitting.
If the end of the trunk is unsupported
If the end of the trunk you intend to cross-cut is suspended in the air, you must cut it from above to avoid trapping the saw. But first make a shallow cut in the underside of the trunk at the cutting point to prevent the trunk from splitting.
If the saw becomes caught in the cut
Sometimes it can be hard to judge how a log is lying. If the saw becomes caught you must never try to shake the saw free with the engine running. You could injure yourself and damage the saw. Instead you should stop the engine and prize open the cut to release the saw. Work calmly and methodically.