[ she nods at that again, as a promise. while steven can't hear what they're saying (nor does he want to eavesdrop), he does speak up from the other side of the door. ]

Make sure you fully consider the decision you're making, Frisk. Those masks no doubt come from CERES, which means that they're unpredictable. If you destroy it, you may be tempting a repercussion that we won't be able to help you with.

[ he doesn't mean to scare them, but he wants them to understand the risks that could come with doing something like this. he can't stop them, but he can at least inform them. ]