last year, we talked to mark colclough, a british-danish psychotherapist who witnessed the killings atafe. special correspondent malcolm brabant has been back to see him at home. >> reporter: we're driving to fyn, denmark's central island, where mark colclough now resides. it's 100 miles from his previous home in the capital copenhagen. in the search for peace of mind, he's found it necessary to immerse himself in the tranquility of nature. >> paris has changed us on a profound level. it's so profound, we can't quite touch it yet. within that change, in the last year, i've noticed how much i need to get away from the city. and get away from congregations of people and sudden movement and this kind of, you know, this head tick buzz. copenhagen's not a busy city by any means, compared to paris, but it's a lot busier than this. and i've really felt the need to have some space, some peace and quiet where i can be myself and predict what's happening. i'm an ordinary guy. and i was walking down the street in paris on an ordinary evening in november and i saw absolutely extraordinary events t