Gil Vicente won game 1:2 and it was crazy game, 2 Porto players got red cards and hosts were angry about referee. Though, Pepe also deserved red card, but referee probably didn't wanted to leave Porto with 8 players.
Actually, Porto scored first goal on 13th second of game, but there was offside. But I just can't understand such things - you prepare whole week for the game and then you lose concentration on first seconds of game against team like Porto. And then Gil Vicente got lucky again, Porto managed to score playing 9 against 11, but there was another offside. And in general, despite that Gil Vicente had 2 players advantage for big part of game, it didn't looked like they have such advantage. Anyway, they won the game and indeed, Benfica is celebrating, it's already +8 in Lisbon.
It was really a very lucky combination, Gil Vicente got this victory. In 53 games that these two clubs comforted, Gil Vicente only won 6. So all statistically was not expected.
Clearly Porto lost its head after conceding the first goal, which can happen. A team like Porto cannot be as shaken when it suffers a goal from a team like Gil Vicente.