Yer that defiently looks like it is unscrewed all the way... Get a fuffly and push the bolt out from the other side... abit of force should realease it... if you manage that post back up and i can explain how to get it back in
http://forums.matrixowner.com/showthread.php?t=10195
http://forums.matrixowner.com/showthread.php?t=10195