It's such classic super-hero behavior. Spider-Man tells Daredevil "I can't let you go get killed, the Vulture is my problem," and knocks him out from behind. You've seen it dozens of times, and it's hard to find a hero who hasn't been beaten over the head (or blasted with a stun ray or given knockout gas) by a friend for his own good or because the friend has something he just has to do. It's only shocking because it's a woman getting the treatment.