1. We have no idea how strong Jaune's shield really is. The shield is just as old as the sword itself, and given how it is almost certainly the same sword we see in the Beacon statue, the shield is likely much, much tougher than Pyrrha's. Remember, pyrrha's shield was used as a throwing weapon, hence it needed to be lightweight. So, given that Jaune's shield has since been upgraded, it could easily be strong enough to withstand Cinder's fire, even if only for a short time.

2. Cinder's power is NOT infinite. The Maidens' powers are specifically tied to their Aura. Therefore, they have limits.

3. EVERYONE'S Aura is able to deflect bullets. However, Cinder's Aura, like that of everyone else, is NOT limitless. And we already know that Jaune has a lot more Aura than most.



There. Every single point you raised can be easily countered. And that's without taking Jaune's Semblance into consideration. There's likely a very good reason why his Semblance hasn't been revealed yet.