The first legs of this season's UEFA Champions League round-of-16 ties are done and dusted.
Arsenal already have one foot in the quarterfinals thanks to their 7-1 demolition of PSV Eindhoven, but the rest of the matchups are mostly delicately poised.
How on earth did Paris Saint-Germain lose 1-0 to Liverpool? Which teams need to switch up their tactics? What can we expect next week? ESPN writers Gab Marcotti, Mark Ogden and Julien Laurens tackle some of the most burning questions after an excellent round of midweek action.