Answer:
1. put away the knife, put a towel to his injured finger to stop the bleeding, after that bring him to the sink to wash his injured finger for it to clean it and prevent the tetanus.
2. Quickly put some water to it to reduce the heat .
3. slowly put cast on the arm so support the arm and prevent being stretch and bring him to the nearest hospital.
4. quickly jump to the river and carefully lift him
5. do not touch the injured part of the victim,immediately call the ambulance.