Touching Lightning
Cain and Jin Ya's conversation wasn't telepathic. Everyone could listen to them.
Hearing these two so causally speak with each other was a bit of a shock to the other disciples. Even more of a shock was the fact that none of them could actually deny Cain's words.
Some disciples there could recall their own first time ending miserably. They needed to repeatedly come back until their Spiritual Sea can just barely adjust to the severe pressure. Even now, some disciples still have trouble bearing the pressured atmosphere.
Cain's words alone caused a slight sway in the disciples' minds.
Jin Ya didn't care about other reactions, more so focusing on her comparison with other disciples.