following this thread I share he same scepticism voiced by others and the one question that springs to my mind ( please bear with me as I'm not an outdoors person myself) can we be sure that this was a pack of wolves. I heard some tales of feral dogs acting as a pack. If I remember correctly there is a thread here about it.

As I say just spectulation on my half, I could be wrong it was just an idea that came to me.