That's right, Hikaru only used a single move to destroy all five players. However, he didn't use the Thunder Spear but rather the new weapon he received in the Void Challenge.
Hikaru stood in the Simulation Space with a puzzled expression on his face as he muttered, "Strange. Why was Sherwin defeated by those five players? Obviously, they're not too strong and they don't have any special skills."
"I want to see Sherwin fight the other five players again."
[Ding! You cannot watch the same event in the future more than once.]
Hikaru frowned. He asked Rika: "Is there any way I can see the future where Sherwin fought the other 5 players? Or the reason they beat him."
[Maybe I can help you. However, you won't be able to see the outcome of this war because you have already seen it.]
Hikaru nodded. A message popped up about a minute later.
[Ding! You need to pay 10,000,000 soul points.]
"Agreed."