Given the point you make, I suppose it would have made for an interesting situation had the Citation flown what I assumed to have been a home made approach and then gone missed. Would they have ended up conflicted with EDDF traffic?
In practice, with the performance of a Citation, no more practical risk of that than a missed approach in good VFR by day I would think. The EDDF CTR starts about a mile beyond the end of the runway. So turn away to the south and climb to about 1400 ft. But almost impossible to construct a turning missed approach in compliance with PANS-OPS, which assumes a 2.5% climb (150 ft per nm). I wouldn't be surprised if a Citation could exceed that by a factor of 5 to 10.