Sorry, Peridot. Lapis isn't really all there right now, and all she hears is 'It's technically contagious', but it's not corruption, but Peridot is being affected and she needs to find some way to fix Peridot before it gets worse. Whatever 'it' is or means. Also before it affects her.

"What do I have to do to fix it-" Well, at least Lapis is putting Peridots safety above that of the other trapped lapis lazulis. Look how much she cares for you. That being said, as soon as she does take a step towards Peridot, she is keenly aware of all of them staring back at her and loudly begging for freedom. "Peridot, I need to get them out of here, they're trapped like I was, you have to help me!"