They scored their second goal during the spell in which we were coming into the game and applying some pressure, so making immediate subs wouldn't have made sense given the players already on the pitch must have been doing something right. More than that, Hughes knew he'd have to withdraw faurlin/granero eventually (both lacking match fitness), and ferdinand had already taken his clattering. All three subs made were forced upon Hughes. If we'd subbed johnson/park on 61 mins after their goal, then we'd have had no one left to replace our midfielders who were lacking match sharpness, or our centre back who'd taken a whack!