Taut-Line Hitch: Perfect for guying out a tent, this knot can be adjusted on a tightened rope without releasing the tension on the line.
He'd likely have a black one of these stashed wherever, or something similar. Multi-Purpose 1 day pack ( FirstSpear is a brand created by former U.S. servicemen, they develop enhanced light-weight load carriage solutions for the US Special Forces )
Know you knots with this chart!
Woof'em: A Campfire Treat - Made To Be A Momma