MacNair didn't jump. He'd learnt years ago not to show when he was surprised, but he hardly had call for it. It was rare that any creature surprised him like a werewolf could, they were too smart, all of them, but there weren't many creatures to rival them- only vampires and humans, and you could hear humans a mile off, and vampires, well, you didn't have time to react, even if you had heard them approach. No, it was best to control that reaction, push it back and just react. Being surprised lost you valuable time, and when dealing with the dangerous beasts that crept about the countryside, it could loose you your life, and that was the one thing that MacNair found himself surprisingly attached to.
"Evening, Fenrir." He said after a moment, taking the cigarette from between his lips, holding it between middle and index finger as he leant forward to pick up the bottle, looking over the label and smirked slightly, nodding his head in thanks to the werewolf. "Stolen or paid for, Greyback?" He asked across the camp-fire, unfastening the bottle and taking a swallow. "I suppose I do owe you. But as you can see, I'm rather short of supplies here."