Yale's father had been trapped for quite a long time, but his life had never been in danger until that moment.
The main reason for that was that he could serve as a bait to the Battle God, and they planned to give him to the members of the other universe after the invasion.
As the husband of one of the two sixth level immortals of the universe that they knew about, his value as a hostage was incredibly high because he could be used to restrict the movements of his wife. After all, they weren't aware of the existence of the Mysterious Expert until the previous battle started and the Mysterious Expert sealed the area.
However, the hostage needed to be in a good condition or else would just trigger the anger of his wife, and the plan to restrain her would fail.
