Bilbao didn't put up much of a challenge and that was very disappointing, based on their position and the fact that it's the Europa league Manchester united wasn't supposed to defeat them that easily...a lot of us assumed they might even win but they ended up not scoring even a single goal.. After the first goal scored by casemiro Bilbao got a red card and it turned everything around, they didn't have the energy to push forward in the game..all the same even without the card united would have still won the game because they are determined to, kudos to them.
I think the red card they got demoralized them entirely and they were not themselves again till the match ended. Do you know what it means to be left with only 10 men when a goal has already been scored by Manchester United's Casemiro, though i also fault Manchester United for not scoring a single goal in the second half and the worst part was even the aggressiveness of their players that led them to yellow cards in the second half. If not for Bilbao's red card and the fact that they already conceded 3 goals, they could have still come up with a way of tackling United but they just lost all their energy when they realized it was already late for them. Players should be disciplined enough not to get involved in a red card, it kills a team's morale hence Bilbao couldn't make anything out of the match again. Being relevant in the La Liga didn't make Bilbao stronger than Manchester United even though they could have played better and protect their home ground. Manchester United was quick to take the advantage that was presented to them which was a very good move because they are confident of reaching the finals after the second leg.