Why did James not defend Paul? Does James failing to defend Paul mean that James' faith is one without works?

I am pondering this question and would like other people's help/thoughts. James, the brother of Jesus, author of the Epistle of James and leader of the early Jerusalem church, writes in the book of James, "Faith without works is dead." He clearly sees that faith leads a person to action. Yet, in Acts 21, Paul comes to Jerusalem and James tells Paul to perform the Jewish ritual of purification so that other Jews do not wrongly judge Paul as being anti-law. Paul does what James asks, but the plan does not go well. Paul is nearly killed and is imprisoned. Here is my question - why did James not support Paul when he was arrested? Where is James' faith in action supporting and caring for Paul?