Knowing that Shuangtian was willing to actually legitimate and officiate this issue, Draco and Eva understood that there was no chance to run anymore. Shuangtian's Truth Branch allowed her to not only make contracts but also enforce them.
Currently her Eternal Control over that branch was pretty low, so she only had access to the most basic ability within which was the Direct Contract.
The Direct Contract was pretty much like the name implies, two parties would officiate a contract in her presence with her actively channeling her bloodline ability to seal it.
The universe would then bear witness and be the record holder. If both parties were weaker than Shuangtian, they would be compelled to follow the terms without her having to do anything.
