This is a FOX NEWS ALERT---CTU agent Curtis has not arrived back at HQ yet with Bierko even though he left the scene almost an hour ago. It must be that damn LA traffic. It gets you even at 10 P.M.
Actually, Curtis might not be seen much longer. He is listed in the official description for the next episode (5.17) but is not listed in episode 5.18.
And before anyone complains, this is not a spoiler. This comes from the officially published episode description.