There are a couple ways to read into that post match scene. For me it seemed more to do with proximal emotions of nearly overcoming essentially a starting handicap, just moments after Trossard and Partey's attempts, minutes after a 2 goal comeback, and after a whole game expended chasing. Thats gotta be taxing, and for me the outcome of Wednesday is going to come down to how well this team recovers on some physiological stress markers. Which I don't know enough about, admittedly.
I think I am more bullish than what I am reading here, but also think the match carries a high risk of quickly devolving. I don't think it's a must win either, but certainly is a must not lose.