The Icelock Breach

A demon stepped through a rift in the Icelock survey ground and the surveyor wants it closed.

Requirements

Meet the surveyor at Icelock Bank
She has melted footprints in a folded oilcloth. 'Stepped right out of the survey ground at dawn. The trail went south and the snow boiled where it set down. Find it and close the rift.'
Read the breach at the survey ground
A tear in the air the size of a doorway, edges glassed from the heat. The rift is still open, smaller than it was, but pulling at the cold around it. The trail of melted snow runs south past the survey post.
Borrow a binding charge from the hideout
The plunder boss at the hideout slides a binding charge across without comment. 'I owe the surveyor a favor. The charge'll hold the rift closed for an hour after you trip it. Make the hour count.'
Brew a steadying draught at the cauldron
The cauldron tender brews a steadying draught for you in five minutes flat. 'Drink it before you close. Your hands will hold and the cold won't take you.' You pocket the flask.
Close with the demon in the hollow
It was waiting in a hollow a quarter-mile south, half-curled around its own heat. You closed under the steadying draught and finished it before it could step back through the rift. The body cooled by the time you walked away.
Trip the binding charge at the rift
You set the charge into the rift's edge and trip it. The tear sucks closed in a single beat. The surveyor's marker poles sing for a second from the pressure change, then go still.