Final answer:
The battle in the Arch could have been different without mortal spectators in various ways, such as increased confidence and better fighting from the demigods, potentially more powerful titans, and a higher likelihood of demigods retreating.
Step-by-step explanation:
If there were no mortal spectators in the battle in the Arch, several things could have been different. One possibility is that the demigods would have been more confident and fought better because they wouldn't have been distracted or influenced by the spectators. This could have led to a more effective and coordinated attack against the titans.
Another possibility is that without mortal spectators, the titans might have been more powerful and difficult to defeat. The absence of spectators could have removed a potential source of encouragement and motivation for the demigods, which might have impacted their performance in the battle.
It is also possible that the demigods would have been more likely to retreat if there were no mortal spectators. Without the presence of spectators cheering them on and providing support, the demigods may have felt discouraged or lacked motivation to continue fighting.