Originally Posted by
Endus
1> Dean doesn't have the Mark of Cain any more, so he's no longer an invincible murder-beast, which was a BIG part of why he was smacking so many people around recently.
2> She doesn't have "battle experience". She's part of a group that's trained themselves for centuries to battle the supernatural, including gods and demons. They haven't had a monster-related fatality in Britain in decades. That means not a single demon taking a single host, for instance. Because the wards fire, they show up and kick its ass, and Bob's your uncle. She's specifically trained to beat the shit out of angels and the like. Sam and Dean are the best in their amateur circuit, but they've just run up against the pros.