I think that PSG will score in the second half. If Chelsea lead 1:0 at HT, which is enough for the Blues to get into the quarterfinals, then Paris will have to go forward. If the score at HT is in favour of PSG, Chelsea will have to attack, leaving open zones behind. In the last year, PSG scored in London in the second half. Two years ago they also could’ve scored, missing some very good opportunities. So, the French team’s goal in the second half looks logical.