I was actually sort of disappointed he went off because he was absolutely terrible, Saint Maximin had him on strings .. just didn't have the agility to keep up with him.
Cedric replaced him. Tomiyasu actually has some positional sense, even if he's not quick enough to keep up with Saint-Maximin. Cedric doesn't even have that. ASM should keep running at Cedrc, and if he does it enough, he should be able to earn an easy penalty.