Ye Mo was weaker than both of them but his spirit sense was stronger than both of them. The blue dressed female immortal was great extreme immortal primary stage while that grey robed immortal was great extreme immortal middle stage. Ye Mo's spirit sense was great extreme immortal tertiary stage, plus his cultivation method was good at stealth, so the two didn't notice him at all.
Four hours later, the great extreme immortal suddenly sped up. The female immortal immediately noticed she was being followed, but at this time there was no time to get away. The grey robed great extreme immortal already stopped the female immortal.
Ye Mo immediately hid on the side. This female immortal helped him once, if possible he wanted to help her too. When he saw the blue dressed female immortal stop, she didn't seem to be scared of this great extreme immortal and scanned around instead with her spirit sense.
"Why are you following me?" The female immortal stared coldly.