[Sparke]

This isnt very helpful and it's rip'd from SA-MP Wiki

lemme explain;

pawn Код:

public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid, bodypart) // Your simple call back for whenever a player takes damage
{ // Opening bracket
    if(issuerid != INVALID_PLAYER_ID && weaponid == 34 && bodypart == 9) // This is getting the weapon id (For this case it's Weapon id 34) and it's getting the bodypart which is ID 9 (The head) 
    {
        SetPlayerHealth(playerid, 0.0); // This just sets the players health down to 0
    }
    return 1;
} // Closing bracket