Can only hope the lad comes through it, thoughts with his family and friends.
Done a few CL away games myself and felt a bit nervous a couple times. Gladbach a couple years back, ended up on a bus going in the wrong direction, dropped me and my dad off in the middle of nowhere. Thankfully a couple of German lads helped us out and how to get to the station and back to Dusseldorf but you never quite know how its going to go down if you start asking for something, even as honest as directions to the train station.
Was at Madrid a few years back when the Police went on a wrecking mission on fans coming out the stadium. Haven't seen anything like that since thankfully.