Both Marcus Rashford and pundits Paul Scholes and Owen Hargreaves were convinced that Jules Kounde should have been penalised for a foul on the England star that would have seen him sent off the pitch.
On the night he scored his 14th goal in 16 games - and his fourth in as many games - Rashford was left mystified as to why he was not awarded a foul after Kounde's challenge.
In the 64th minute, and with the visitors 2-1 up on the night after Marcos Alonso had got the hosts ahead, Rashford was released in behind the Blaugrana defence by Bruno Fernandes.