The correct answer is: That big fist....
Explanation:
1. The source or origin of the energy the person is feeling after getting punched in the face is the impact from the big fist that delivered the punch.
2. When a person is punched in the face, the energy from the punch is transferred to the person's face, causing the sensation of pain, impact, and reaction to that force.
3. The energy is directly linked to the physical force exerted by the punch, making the big fist the source of the energy felt by the person who was punched.
