Orion is the sacrifice for Vecna (like Max in season 4) so that the group has time to kill him. But Steve doesn’t like it. He hates it, actually. But everyone voted against him saying no. They all said Orion was the best option. Even though that’s Steve’s baby. The kid he vowed to protect. Putting their life on the line like it’s nothing. So now he’s watching in terror as Orion fights against Vecna while they’re under his control. Orion doesn’t almost die and end up in a coma like Max, but their powers get drained by Vecna while they’re in his mind, so as soon as they wake up, they just fall limply against Steve, completely unconscious in a way that terrifies him.