It is not that no other consciousnesses are aware of the event - it is whether the event has moved from a probability into a physical result in the data stream. Whether that lump that was found is still just an unknown versus the lump has been biopsied and found to be cancer. The randomness of the event is usually much larger in the probability stage than when it becomes known.
You should always go to the doctor if you suspect you are ill and not rely on Intent to cure you. You can certainly use a strong focused Intent before you go, but it is folly to depend upon that alone.
You have no way of knowing the probability of many events. There is a lot of randomness in the system but there is also a rule set. If you get bitten by a highly poisonous snake there isn't much randomness.
The probability of the event happening and the nature of the event (what happens) are both influenced by the overall long term effect that event is likely to have. Such long term far ranging effects are often difficult for us to comprehend, much less compute or control, and thus results are not always predictable.
That statement will surprise and baffle you if you think of both NPMR and PMR causality in terms of lifting rocks. In NPMR things are connected more than they are separate.