Dick had just finished speaking with the creator, at the ends of the conversation, the creator had asked him if he was interested in half of his essence and he had undoubtedly said yes.
The trials was supposed to begin immediately but Dick had said he had to see Lefinna first, the creator was lackadaisical about it so he allowed Dick to go.
Lefinna was still frozen in the same spot, she had a look of amazement on her face, before she disappeared, she didn't want to go away, she wanted to stand and face Larias with the rest of them but she wasn't given much of a chance as almost immediately, she found herself in that realm and her body was frozen.
The same was for Angel and Michael, Angel wasn't really so key about whether she was frozen or not.
The mistresses had relayed the plan earlier on to her and the generals so they understood why things were happening the way they are.