C# protected and an assault

goo.cs

using System;

namespace Bacon
{
    class Victim
    {
        protected int money = 100;

        public override string ToString() {
            return this.money.ToString();
        }

        public void reclaim(Offender offender)
        {
            var diff = 100 - this.money;
            offender.money -= diff;
            this.money = 100;
        }
    }

    class Offender : Victim
    {
        public void assault(Victim victim)
        {
            this.money += victim.money;
            victim.money = 0;
        }
    }

    class Prog
    {
        public static void Main()
        {
            var victim = new Victim();
            var offender = new Offender();
            offender.assault(victim);
            Console.WriteLine(victim);
            victim.reclaim(offender);
            Console.WriteLine(victim);
        }
    }
}

/* Compiler errros:
goo.cs(26,34): error CS1540: Cannot access protected member `Bacon.Victim.money' via a qualifier of type `Bacon.Victim'. The qualifier must be of type `Bacon.Offender' or derived from it
goo.cs(8,23): (Location of the symbol related to previous error)
goo.cs(27,20): error CS1540: Cannot access protected member `Bacon.Victim.money' via a qualifier of type `Bacon.Victim'. The qualifier must be of type `Bacon.Offender' or derived from it
goo.cs(8,23): (Location of the symbol related to previous error)
Compilation failed: 2 error(s), 0 warnings
*/