This week: At Carter\u2019s urging, Neela takes on a bigger role in patient care (with mixed results), Chuck gets into a fight with a creep who won't leave Susan alone, Chen can\u2019t catch a break, Gallant reveals his feelings for a colleague, a recovering Frank pops in to say hi to everyone, a group of tennis players beat up a flasher, and Luka takes over planning for Alex\u2019s birthday.