User blog comment:SomeoneYouUsedToKnow/SYUTK's V5E7 - The Gang is Back (almost) - Impressions/Recap/@comment-34633327-20171130003444/@comment-34633327-20171130024151

I probably should have made clear that I believed Ozpin's powers worked in a similar manner to a Mana Gauge, except his doesn't actually build back up. Every time he uses his powers, the gauge depletes a bit more, hence why he doesn't use them leisurely, as the power is limited. That's also why I thought the Maiden's powers were limited, as even if they came from Ozpin, they too would be composed in a "gauge" and as such would eventually run out. That's what I meant by them being finite.