Secrets of The Soul (1).

"So, where do you think he is?" Steve said to Susan who stared into the far-off horizon. 

"Probably got eaten by some sea creature..." Susan said casually. 

"Eh? Why would you want that happening to him?!" Steve asked incredulously. 

"Cause he's an idiot who underestimated himself!" Susan said with a harrumph. 

"Haha! Why didn't you say all that while he was still here?!" Steve said with an amused laugh. 

Susan rolled her eyes as she responded in a freezing tone, "Cause then he wouldn't learn his lesson. That would teach him not to run off on his own." Susan said with spite.

Apparently, she was a bit pissed off by Cain's decision to up and leave so suddenly. Not only that but he had been gone for more than a few hours.

"Still... How is he able to stay underwater for so long without needing to resurface? Could it be that he..."

"He's definitely not dead," Susan said with surety.