Not truly a spoiler since you could figure it out by re-reading -I'm guessing that's the other dragon and she wanted to fight him.
The Goddess truly doesn't care about him. Some are saying the Goddess is trying to get him killed but that isn't true. She is simply trying to make use of him to help the situation. It might have helped more to explain to him even slightly LOL, let alone get him to agree. She's dumb and she's a bitch though, so she did none of that. Why she didn't do it sooner? She couldn't find him on account of him suppressing his mana. She found him mid-teleport. She thoughtless used the opportunity to dump him on the battlefield. Her golden mana made everyone see the Goddess sent him. However that he would side against the Hyumans against the Demons is merely an assumption based upon that golden light. And as you see, Sophia is working with the Demon side thus she launched a surprise attack. The Goddess likely assumed that if he got attacked, he's have to defend himself and do a lot of damage to the Demon side. She doesn't especially care if he survives or not just as long as he serves the purpose.The Goddess throwing him into the fight to try to sacrifice him instead of losing her heroes makes a lot of sense and is what I thought at first, but why wouldn't she throw him where it mattered then?