/// <summary>
/// When an enemy is killed, delete it and replace it with its corpse.
/// This saves processing it for collisions etc.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnEnemyKilled(object sender, EnemyKilledEventArgs e)
{
Enemy enemy = e.enemy;
killList.Add(enemy);
Decal corpse = enemy.CorpseAppearance;
corpse = corpse.Clone() as Decal;//New instance of the corpse decal
corpse.Effect = enemy.DirectionalEffect;
var offset = enemy.Appearance.Size - corpse.Size;
corpse.SetPosition(enemy.Position + offset);
corpses.Add(corpse);
}