All Heather could do was stand and watch, exchanging worried glances with Faith and feeling her heart jumping into her throat with everything that was said between the two, with every hit that was given and recieved, psychically performed or not. It killed her not to be able to do anything to help, but she knew this was something that she had no business getting directly involved in. What she'd already done was quite enough.
It didn't look like things were going to end up in their favor, based on the way the demon was punching Sam's face and ribs and pinning him to the wall. But then something happened. Sam managed to get free and bash the demon's face into the wall a couple times, and once that was done, the whole thing just turned around. It wasn't in the manner she'd expected, though, and her eyes widened as she watched the black smoke streaming up out of the demon's mouth. She flicked her gaze between it and Sam, her heart pounding a steady, hard rhythm inside her chest.