Cool and finally well explained with pictures too!
Sorry Dfrog...
Before later versions of the 109 had dedicated 'flare pistol' ports/openings, the left fore-window (removed from F+ series) or side-window was also used to 'flare' from if not for combating alttitudic pressure reduction induced fart effects.
Of which as a joke, why else is there always a wheelchair with the staff that open the doors at the airport after landing, all those passengers pretending they didn't squeeze them onto the cushions.. or what you suffer from if you've recently surfaced form scuba diving.
That guy as Crazyflak said, does really look fecked off, like upon opening the canopy that somebody said something really really stupid, or he just happened to park and open up within someones (or some camel's/donkey's) lingering fart gas. ..or it could be the 'ground heat' hitting him, since he's below and in hot air trapped in the 'ground effect' (Earth's boundary) layer.
Incedently he does have almost a spookely twin-like look of my step father about him, and he's still alive; 80/81years and/but Danish - he was in his low teens in mid 40's back then in Danish Resistance. - the pilot appears in his mid/late thirties then to me and for up until his late 50's, my SF could be his younger doppelganger - based upon that 1st pic.