I was watching part of the game again and its funny what different people see. I saw Pogba choke and then chuck Henderson to the ground, a straight yellow in most cases. Then while watching Herrera's pass to Mikhy I noticed Can moving in past Pogba to block the pass from Herrera only to be whacked deliberately on the face by Poggers. Can went down clutching his face. Another yellow card.
A red would have meant the referee denying Liverpool keeping their most valuable player on the pitch so you're right, its swings and roundabouts.