First I was wondering why they were burning fuel, I'd imagine even if they were tankering in BEG and carrying more fuel than necessary for the flight to DUS the E195 would be able to reland immediatelyß But they might have been worried about the state of the landing gear and not be aware of the substantial damage the aircraft suffered? Don't wan to armchair pilot that (in particular as I am not a pilot).
But as per video (and an article in the usually quite well informed ex-yu-aviation) they taxied (or towed the plane) to a etbridge and was foamed there? I've never seen this before and would have expected the aircraft to be evacuated on the runway or at least taxied to the nearest remote stand instead of parking it right in front of the terminal and connecting a jet bridge?