Haddock looks very concerned. Why is he carrying… what even is that? Bread? A wheel of cheese? Tintin, where did you get that lamb? Why are you staring at me?

A giant pumpernickel?  Calculus and his little pendulum. And Snowy…Snowy you’re about 5 secons away from frostbite.

I assume they will be sacrificing that lamb to the blood god shortly.

of course, that makes sense, Calculus is dowsing to find the right intersection of leylines for the ritual. Haddock’s bread and wine are for a blasphemous parody of communion. They’re all a bit glazed and starey-eyed because they got good and blitzed before they came up with this plan. The biting cold is starting to sober them up, and they’re all beginning to feel a bit foolish and reluctant, but nobody has the nerve to be the first to back down.

Guys you really shouldn’t try to piece together occult rituals from stuff you see in horror movies. There are proper books about this sort of thing. 

If you wanted to raise a creature from a Hellmouth you guys need to look at better sources than the Dupontd Detectives.