Improper use of automatics...
What I still do not understand, is why they didn't fly a LOC approach or VNAV as only G/S u/s if they were so concerned about a visual approach and its perceived problems.
But having set the Missed Approach Altitude to 3000', every Boeing pilot knows that pressing FLCH will cause the aircraft to climb up, not go down. Basic school boy error, like hitting TOGA instead of A/T disconnect as sometimes seen on another Boeing type due incorrect throttle positioning of the hands. Time and height permitting if can be corrected with visual references: continue, otherwise the best course of action is to continue that climb and try again.