[[ABK]Antonio]

I would do something along the lines of this.

pawn Code:

public OnPlayerTakeDamage(playerid, issuerid, Float:amount, weaponid)
{
    new Float:stat[2];
    GetPlayerHealth(playerid, stat[0]);
    GetPlayerArmour(playerid, stat[1]);
    new Damage;
    switch(weaponid)
    {
        case 31: Damage = 25; //set the damage here for when this switch is over
    }
    if(stat[1] > Damage) SetPlayerArmour(playerid, stat[1]-Damage);
    else if(stat[1] == Damage) SetPlayerArmour(playerid, 0);
    else if(stat[1] < Damage && stat[1] > 0)
    {
        new subval = floatround(stat[1])-Damage;
        //takes their armor, subtracts 25 from it. Then it adds that negative number to their health
        //For instance, 15 armor -25 = -10. So we subract 10 basically.
        SetPlayerArmour(playerid, 0);
        SetPlayerHealth(playerid, stat[0]+subval);
    }
    else SetPlayerHealth(playerid, stat[0]-Damage);
    return 1;
}