I am fully agree with Bhikku Bodhi.
It is true there is no clear cut in sila. If there is a clear cut, it is against the highest Buddhist teaching of Anatta.
For practitioner like us, sila is important, because we still subject to sense of self. As long as there is this sense of self, we are subject to good and bad karma.
Buddha is free from karma because he doesn't have the notion of self at all. In this case, whatever he does, he is not subjected to karma.
Karma just mean action. If we give Buddhist teaching, there is a good karma, because we still have the sense of self. Doing the same thing, this action doesn't give rise good karma to Buddha.
When there is no self, there is no karma. Just because there is no actor, we cannot have the action.
We can slay the sky, but the sky will not get hurt.
Even when the Buddha kill someone, he will not be subjected to bad karma.
The difference is for us that action looks like killing. But from Buddha eyes, that action is not killing. Just like the mountain eruption is considered natural disaster from human eyes, but from the eyes of nature, it is not a disaster.
Only someone who is absoluty free from the notion of self, he is beyond the touch of karma. For him there is no longer boundary and clear cut in sila.
However, it is warned that as long as we still have the notion of self, sila is the only guide to keep us in track.
Sila is not the rule that put us in the jail. Sila is the guide that bring us beyond the sila.
I am not here nor there.
I am not right nor wrong.
I do not exist neither non-exist.
I am not I nor non-I.
I am not in samsara nor nirvana.
To All Buddhas, I bow down for the teaching of emptiness. Thank You!