Jo was too tired to argue, so she just did her best to push her sleeve up so he could get to the wound. She was tired, but she wasn't going to pass out. Not here. Not now.
She was surprised when he revealed his face. If he was a kidnapper or some sort of bad guy, she'd assume that this was the point when he'd decided that he was going to kill her anyway.
But as far as she could tell, he wasn't the bad guy. He was the guy who'd saved those people and was trying to make sure she didn't bleed out in Aisle 3.
She thought on the robbers and shook her head with a sort of laugh.
"Guess the Hellmouth attracts perfectly human crazies too," she mumbled.
She wasn't exactly thinking clearly. If she had been, she probably wouldn't have mentioned the Hellmouth in front of someone who probably wouldn't know what it was or what to make of it. That wasn't something she just went shouting about under normal circumstances after all.