As soon as Childermass realizes just how much they cut up Lambert, he's turning to look elsewhere. It won't be until he's covered up in the illusion of Ignatius that he'll turn back again and even then it's only to protest.

"Unless someone has an extra pair of pants, I think not."

He's stoic about a lot of things. Like, a ton. However, he is also still from the 1900s and used to wearing like five hundred layers of unimaginatively black and white clothing. Anyway, whoever asked for healing potions is getting them. After that, he's shutting the dimension back down.