Just googled body language interlaced fingers out of interest and looked briefly at a few pages. This page (13 Revealing Body Language Hand Gestures) describes what FF is doing, and attributes a meaning to it as pasted below. FF really grips as 33:21 (after being asked was CB acting with someone) 33:52 and 34:03 (when being asked what he would do if client were lying). I'm surprised at his apparent lack of awareness of his body language, given his profession. 10. Clasping hands, squeezing hands Clasping and squeezing hands together is a self-pacifying gesture. A person who does this is uncomfortable, maybe even nervous or fearful. He's trying to assure himself, “Everything's going to be alright.” A variation of this is rubbing the wrist. Clasped hands with interwoven fingers indicate great anxiety and frustration. That person is thinking, “Things are going really bad”. You better prepare yourself when you spot this.