Combeferre

"I won't try to make Thalia appear," Combeferre says firmly, as he attaches the strap to Bahorel's arm. "It's much too dangerous."

Bahorel somehow manages to convey the impression of pacing recklessly despite being ensconced in a chair in Combeferre's and Enjolras's rooms.

"This won't make a daemon appear, but it should measure something correlated with the presence of a settled daemon."