Peter stares down at Liz intently, trying to keep his focus on her and on the periodic table and on how people are trying to help them. That's more that he had at the warehouse, he tells himself, but he find considerably less comfort in that than he probably should.

Compounding those feelings is the increasing level of fatigue he's feeling at holding the weight of everything off the both of them. He wants to try again, but not if it means potentially hurting Liz.