private static void CollidePlayerBullet(PlayerVerticalShooter player, EnemyBullet bullet)
{
player.InflictDamage(bullet);
bullet.InflictDamage(player);
}
private static void CollidePlayerEnemy(PlayerVerticalShooter player, EnemyShip enemy)
{
player.InflictDamage(enemy);
enemy.InflictDamage(player);
}