Better than nothing is all he needs. Sokka had considered a lot of options for this plan. Tying him up, trying to restrain him, or some other way of disabling him. In the end, he settled for something brutally efficient. Something he hadn't quite agreed with Winry on. Sokka abruptly stepped out from behind Ed and with the butt of his sword, proceeded to aim a blow at the back of his so-called best friend's skull. This would be much easier if he was just passed out. They could figure out the headache later.