^^^ i hate these, some days they come out easy as, other days they just won't play the game.
i normally use needle nose pliers and compress 2 -3 of the little fingers. as Sam said tilt the cable so the fingers don't click back into place and compress some more, just work your way around until they are all out.
another thing you can do is disconnect the cable from the lever on the SHOE END and slide either a 13mm or 1/2 inch ringspanner over the cable, bring it down to the fingers and depending on the spanner (just try a few different sizes) you can slide the ringspanner over the fingers and it compresses them all at once and it just pops right out.
^^ doesn't work al the time though but has been working for me lately.
