Stay together and watch out for each other.

[...]

I don't know how helpful it is, but Levi found a butterfly pinned to the wall behind one of the portraits in the sauna. And I found one of those puzzle boxes too, but it needs a five digit code instead of four. It says: "SHe ReMiNDS THiS TeaCHeR oF HiMSeLF. i See iT Too."