Spirits can protect the shaman from anyone and anywhere. Even if someone shouted at the shaman, or spoke ill of him (even not in his presence), the Spirits attack this person. Distance does not matter to them. The shaman needs to keep his emotions under control so that he does not inadvertently direct his Spirits against someone.
If the shaman behaves unworthily, carelessly, the Spirits turn away from him and stop helping him. To be rude, cruel, to do outright evil - all this is unworthy of the shaman. Shaman must logically justify to himself each of his actions, before it is done. Thus, he as if he consults with his Spirits. If the Spirits agree with the shaman, the success of the venture will be assured.
Healing without the Spirit is a very dangerous endeavor.
One has to undergo great stresses. These loads are not only mental, but also physical. This stage is necessary for every true shaman, otherwise he will not appreciate and will not know what is really the power of the Spirits. People, as well as spirits, live in the same world.