German media reports that the cockpit crew of this flight has been suspended due to the pending investigation.
It is rather hard to blame the two colleagues for anything based on what is known at the moment. Checking the requirements for visual turns after departure or go around both in the AB regulations and at EDDL airport would be required, as would be knowledge about the communication between the flight and ATC and also the clearances that may or may not have been given.
Although it was probably a non-standard maneuver, it may well have been covered by all relevant books - and the desire to perform it is also understandable. And an investigation may well come up with the result that nothing untoward has occured.
In dubio pro reo...