1. Summoned Skull Attacks: You attack with Summoned Skull.
2. Call of the Haunted: Your opponent activates Call of the Haunted, targeting Summoned Skull.
3. Summoned Skull Destroyed: Summoned Skull is destroyed and sent to the Graveyard.
4. Blue-Eyes White Dragon Summoned: Call of the Haunted summons Blue-Eyes White Dragon from the Graveyard to the field.
5. Battle Phase Continues: Since Blue-Eyes White Dragon is summoned during the Battle Phase, the Battle Phase continues.
6. Blue-Eyes White Dragon's Attack: Your opponent can now attack with Blue-Eyes White Dragon.
Important Points:
* No End of Turn: Call of the Haunted's effect does not force the opponent to end their turn.
* Battle Phase Continuation: The Battle Phase continues even though the original attacker (Summoned Skull) was destroyed.
* Opponent's Advantage: Your opponent now has a powerful monster on the field (Blue-Eyes White Dragon), which can attack immediately.
In short, your opponent does not have to end their turn after activating Call of the Haunted. They can immediately attack with the newly summoned Blue-Eyes White Dragon.