The Philadelphia Union are out of subs and you can't say they didn't go for goals in the second half. Jack McInerney and Roger Torres had already been brought on and now the Union have used their final sub to put Freddy Adu on the field, a third attacking option to enter this match off of the bench for the home side as they try to come back from a 2-1 deficit.
Philadelphia has done a better job of holding possession and getting chances off of crosses, but that's really ben their only source of chances. With Adu in, they might have another option. The nimble attacker can take guys off the dribble and has good vision so he can slip a ball into a teammate. The Union hope that gives them another way of creating chances because while the crosses have been a way of getting chances, it hasn't been a way of getting a goal yet.