Interlocked and extended fingers are a sign of increased anxiety. If you see a person begin to do this, especially during conversation, an interview, etc., you should ask yourself what caused him to adopt this posture. It is very likely a question that what was just asked which evokes anxiety. This is a great signal. You would be well advised to delve deeper and ask additional (open ended) questions which will get to the root of the problem.
In this photo, Dusan Ivkovic, the coach of the Serbian national basketball team is seen answering questions at a press conference just prior to the 2010 FIBA World Basketball Championship.