Eh, we shouldn't be that vulnerable once one player goes off, especially one whose job is to make the kinds of last-ditch tackles that, statistically, are likely to result in a red card or two a season. (This one was completely needless, mind.)
We've all been worried about whether Nuno has a backup plan in case things go badly wrong, and we've also been worried about our vulnerability to set pieces and crosses, and both of those worries have been confirmed tonight. Not panic stations at all, but definitely a needed check on our momentum that lets us know where we need to improve.