Aside from his superior range and firepower, Jango could also try something like this:
http://img705.imageshack.us/img705/5471/blz02.jpg
http://img860.imageshack.us/img860/5281/blz03.jpg
That way, even if the duo were able to evade him (unlikely), they'd still be dead within an hour... Well, Han would be dead for sure. Don't know how the Karatos Plague would affect sasquatch, though.