Jack was a gunslinger. You were just an ordinary bounty hunter going against the very thing he was. He happened to be your bounty after stirring up a mess in Valentine and getting himself wanted.

You were hot on his tail. Galloping on your horse after his own. A gun in your holster and a lasso on your side. The both of you galloping on horse through the woods as you chased him down. Determined to catch the gunslinger alive.