Adam and Shinka didn't even speak or alert each other.
They both sensed a large amount of Evil Soul Power in the distance at the same time and launched themselves towards it at rapid speeds.
With the Burst Movement Skill, Adam's initial burst was faster than Shinka's, but he was shocked to find that she quickly caught up to him and surpassed his speed using some sort of Movement Skill in her Soul Form.
Adam had seen nothing like it, but it was to be expected considering that she was from the underworld and her position within the underworld.
Along with her great speed, her horns began to glow while her entire Soul Form began to be strengthened by her Soul Power as her speed continued to increase.
Although Adam couldn't keep up, his speed was still unbelievable considering his cultivation level and was worried about Shinka being taken down before he made it, since she had already been taken down by the Grandmaster Level Evil Soul once already.