The demigods were gauging the strength of the Neo Angels, but the latter was also doing that as well. The only reason why the Neo Angels were having a difficult time is due to the fact that they were surrounded. Still, the demigods are getting whittled down as the weakest ones were being destroyed by the Angel of Humility Mikhail.
The Angel of Humility Mikhail is not a being that can be killed easily as he has tough defense and great healing from the Angel of Patience Raphael. Attacks that are supposed to hit the Angel of Kindness Raphael are all defended by the Angel of Patience Grabriel. All of the demigods have no choice but to be careful.
