I think Lazio has dropped form this season and Feyenoord are is good form this season scoring goals although I would not have played Feyenoord to win Lazio but I think they had the better chance to win.
But I am shocked about the Barcelona versus sharktar match, I think Barcelona weakness was exposed and they would have drawn the match, Barcelona is finding it hard to play football every match is becoming a struggle.
Feyenoord were slight favorites before the game (probably due to their Serie A status) but in fact they completely crushed Lazio. If now Celtic in the game with Atlético can bring the matter to victory, then this will be another group of death where everyone has a chance and in one round you can move from first place to 3rd place and vice versa.
There's nothing surprising about Barcelona's performance - they have a lot of games like this, and there were a lot of gut-wrenching games last season too, with narrow margins. That didn't stop them from winning La Liga. At these stages, none of this is important.