[Slice]

To disable damage indicators and sounds:

pawn Код:

SetDamageFeed(false);
SetDamageSounds(0, 0);

For your damage system, you will need to do this:

pawn Код:

public OnPlayerDamage(&playerid, &Float:amount, &issuerid, &weapon, &bodypart) {
    if (bodypart == BODY_PART_BLABLA) {
        amount = amount / 2.0; // 50% damage
    }

    return 1;
}