Apart from Keira Leaf, the most important thing now was the safety of Jack and Howard. Once Dragon Carter and Zachary Armstrong found out Keira had been kidnapped by Shane Winchester, they would likely target Jack and Howard to prevent their "stuff" from being handed over to Winchester.
If Keira fell into Shane Winchester's hands, and Jack and Howard into Dragon Carter's grasp, he truly feared he wouldn't be able to keep mother and son safe.
Therefore, at this moment, the children were the priority. Only if they were completely safe could he save Keira Leaf and negotiate with Shane Winchester. Otherwise, being constrained on both sides, he would be completely on the back foot.
Meanwhile, after the medical staff moved Jackson Sully onto the emergency stretcher, they began to use the various equipment and instruments in the ambulance to perform checks and provide temporary emergency care.
