Maybe you are right that it will be difficult for Sevilla to stop Arsenal in the third match considering that they currently have momentum because they managed to win against their tough competitor in the English Premier League, but isn't that also the case when they face Lens? because Arsenal is the strongest team in the group but the result is quite surprising, so it is not impossible that Arsenal will get bad results against Sevilla later.
Sevilla, who saw an opportunity to beat Arsenal because seeing how Lens was able to do it, would not waste the opportunity because this was a home game for them, even though they were very bad in La Liga but there were different things shown by Sevilla when it was a competition in Europe, so I don't pretty sure Arsenal will win against Sevilla later.