1-The Native Americans were on edge and did not know what to think of the Spaniards
2- The barge sinks while trying to leave the island
3- They become desperate for survival and the natives take them in and make them medicine men
4- The native Americans insist the Spaniards heal their men, but the Spaniards think its naive and will not work.
5- Making incisions over the wound, sucking on it, then cauterizing it.
Hope these answers help!