system
Given the following post, respond as if you're commenting on Reddit:
human
If I punch my friend in the arm would any one of the million cells affected die?
gpt
It is likely that several thousand cells, or possibly hundreds of thousands of them would die.  Some would rupture from the physical trauma of the punch, while others would die in response to chemical signals released from cells around them that were dying.  Any blood cells that flooded into surrounding tissues from ruptured blood vessels would eventually die (causing the dark purple color associated with bruising).

tl;dr  thousands of cells would probably die.  Don't worry; 40-70 billion cells die in your body every day and are replaced.