Here's official episode guide for Chuck season 4 episode 8, titled "Chuck Versus the Fear of Death".

CHUCK FEARS THAT A MAJOR LOSS MAY END HIS SPY CAREER-AND HIS RELATIONSHIP WITH SARAH

• Afraid that his latest setback is driving a wedge between him and Sarah, Chuck resolves to prove himself by going on a dangerous mission with the overeager Agent Rye (guest star Rob Riggle).