The Four Horsemen of the Apocalypse

Being small had some small benefits.

It was small enough that it couldn't contain the entity, and so there was no pressure to maintain it. If his control power was raised to the limit, he could even achieve the effect of a time stop.

It was different than Faust's ability to freeze the Physical World. With this, the old musician could choose to speed up time in the spiritual realm by thousands of times. From here it would look like time had indeed stopped in the Physical World.

Through the lens, the old musician could freeze time whenever he wanted, no matter how tense the situation was, he could still take his time to observe and think it through. Through making a thousand observations in a single moment he could find the most reliable solution.