A cursory look of a challenge where he run full pelt into the saints player and floored him isn't reviewing it.
If that was given against us I'd have been fuming with whoever made such a stupid challenge.
(Not everything is reviewed anyway - only every goal is reviewed. After one replay on Amazon we were already taking the corner).
Redmond for Armstrong was the right decision, taking Walcott off was not, he was our most dangerous player and immediately before the sub has got Gabriel sent off which his dangerous turn and direct running.