Drafting

[Facedancer]

Помогите пожалуйста перевести drafting в следующем контексте:

They came to the hill and were soon in the wood. Up the hill they went; but there was no proper path to be seen, such as might lead to a house or a farm; and do what they could they made a deal of rustling and crackling and creaking (and a good deal of grumbling and drafting), as they went through the trees in the pitch dark.

[L-sa]

made...a good deal of grumbling and drafting
пыхтя и отдуваясь