Keep telling yourself that You and Simmons get one of the amulets to protect against demonic possession? You could also go the route of a tattoo so it won't fall off/get lost. Happened to Cap's kid a while back, losing the amulet.
Hey, no plan is fool proof and some intelligence isn't gathered in enough time to make a better difference. Still, the six of us managed to keep things from getting worse. And Tony did stop the Council's nuke from blowing us all up.
So's mine. Unless she's fighting Natasha. That'd be a close match.