The sound of a loud bang, Lydia whirls in place to look toward the source. That was louder than the last one, which Lydia thinks means that it's closer...which is not good. At all.

She can't help feeling more than a little relieved when Barry's on the same side of her argument and Lydia nods as he starts gathering ingredients and bringing them to the table. She's off finding her own, as well. "Do you think if we just contain an acetone peroxide and attach it to the hinges, that would work, or do you think that's too weak?" she asks, curious whether he thinks that'll do it or if they're going to have to go bigger.