Quoted from t3amaw3s0m3:Doesn't seem like it should be stuck... but it is!
As a guess, since I can't fully see in the pics....
Maybe the round "pivot" bolt has partially unscrewed -> this causes things to get stuck.
You need to apply enough pressure to pull it loose, and then re-tighten the pivot head.
Good Luck!
EDIT - I just can't tell from the pics - sorry