The Warrior's Way
(2010)

Lynne (Kate Bosworth) avenges her family by killing the colonel with his own sword after killing Eight-Ball. Meanwhile, Yang, helped by Ron and the townspeople, kill the ninjas (who actually help them by killing the colonel's forces) before slaying Saddest Flute.

Knowing more will come, Yang leaves the baby April in Ron and Lynne's care before heading out of Lode and into the sunset (even though he'd come to love April and Lynne).

As the film ends, his former comrades have tracked him down to a remote snowy, storming location, but Yang is ready for them.

Thanks ND Woods!