[rhds]

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & KEY_JUMP)
    {
        new Float:x, Float:y, Float:z;
        GetPlayerVelocity(playerid, x, y, z);
        if(y > changethistoheightvalue)
        {
            new Float:health;
            GetPlayerHealth(playerid, health);
            SetPlayerHealth(playerid, health-80);
        }
    }
    return 1;
}

I tried something, not sure if in right direction, something is wrong, probably someone else can continue or fix.